Everything seems to be specific to that buyer or seller. His/her/their experience in the process and their individual market.  These factors matter.  A lot.

1. How much?
2. How much?

1. Sellers - What do I need to do to my house to get top dollar?

2. Buyers - Is there any negotiating room or do we have to pay list price...or over?

The ones that I can't answer but, give them references for: 

1. What are the best schools?

2. Where in Charlotte are lowest crime communities?

I don't get any one question on a regular basis... depends on the client. Sellers, of course, always want to know what their home is worth. Buyers always looking for that "deal." I tell them we need to find them the right house and not the deal. Although they do often ask how much a seller will accept. I just tell them I don't know... let's write an offer and negotiate.

Sellers; what my house worth

Buyers; how low should We offer

How much?

Any recommendations? is the question I get asked the most from sellers

Where are the cheap places? seems to be the question of the day from buyers.

Hard to answer that question because every buyer or seller is different. Some things that come to mind are:

1. Buyer - Can you recommend a good lender?

2. Seller - What are my costs once we get to closing?

So many questions from both buyers and sellers, I am not able to mention anything that stands out. For both buyers and sellers, all of their questions are important since they are engaged in a very significant experience.

The big question that I get is how is the market?

1. How much will I make when I sell?

2. Why are they selling? 

"Hows the market?"  I get asked this almost daily.

1. Buyers "Is now a good time to buy?"

2. Sellers "What is the most I can get for this house."

Thomas J. Nelson, Realtor, ePRO, CRS, RCS-D - why is your price is less than Zillow would be #1 question from the sellers.

How much more should we offer for this home? I don't want to lose it! - is buyer's question.

How much can we get....the sellers lament followed with I dont need to sell

i don't list

what did they pay?  

And my normal reply is "what someone paid has nothing to do with it's market value today"

Sellers want to know what is the best/highest price to list for.

Buyers want to know how low they can offer. 

Those seem to be the most popular questions I get from all clients.

Sellers - How’s the market?

Buyers - Hows the market? 

What will it sell for?

Thomas,

I agree with Michael Jacobs 

Just get me the home we like. We want homes that we can not afford to bid high.

It does vary but for both Sellers and Buyers usually one of the first questions will have to do with money in one way or the other

What's it worth

What will we net

What will it cost me

What are the closing costs

These types seem to be the most common opening questions but its not a hard and fast rule

1.  Why hasn't it sold yet?

2. How come my offer wasn't accepted?

Sellers - Can you come by and tell me what needs to be done?

Buyers - Can we start low and negotiate?

How fast will it rent?

From sellers: WHat is my house worth and how ling will it take to sell

From Buyers: Can we make an offer on that $300,000 home when we can only afford $250,000

The question that arises as a result of the "know it all" Uncle Louie imparting his knowledge!

"When are we closing?"

"When are we closing?"

From sellers, how much more will the buyers pay?

From buyers, how much less will the sellers take?

Buyers, "What the taxes?" 
Answer: "The taxes are the taxes."

Seller: "Is it ok for me to be here?"
Answer: "Under no circumstances should be be present with buyers visit."

Out of towner: "I'm looking for a 2/2/2 near the beach for around 100K. Will you help me?"
Answer: "I know a new agent with plenty of time who would be happy to help you out."

At some time in the future some visitor asks, "Is that loaded?"
Answer: "......."

As I'm a woman in male dominated business, my most common question is "How did you get into this business?"

1.  How much money can I get?

2.  What's the best house I can get for my money?

Sellers:  What will I get?

Buyers:  How much will I have to spend?

Sellers - how soon do you think it will take to see an offer, or did you get feedback?

Buyers - do you think we can offer less than sales price, or do you think there are other offers on the table?

Looking back to my most recent "average Joe" clients:

Seller - questions about the process, steps, prep.  It was their first transaction in 10+ years.

Buyer - First time buyers, so a lot about the process and what the next steps were.

How much is commission?

Can we make a low offer?

What can I get and how much should we offer

Sellers - How much will I walk away with

Buyers - will they take less!

What is interest rate and closing cost? Even though both change by so many factors when they change scenario. 

there are many related to money.... it's all about the money.... 

Most questions for both buyers and sellers are around price, money, how much, what will my payment be, what are the taxes, how much in insurance, what will I net from the sale.