So buydomains buy domains for you?
Or they sell expired domains?

IM confused here, someone help

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22 sites and counting

I think it means that you can sell your domain that YOU own, that still work to whomever that is interested.

Ok fair enough, sounds good.
I need to sell some off

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22 sites and counting

Yeah me too. I want to sell some old ones I've had since 99, use that money to register more or buy some and then sell them. For me it's fun. It's like buying and selling houses.

How much is someone willing to pay for a domain from the 90s?

You can consider checking here to find or sell expired domain names:
WebSiteBroker - Websites For Sale. Buy and sell websites and domain names!

The amount that someone is willing to pay for a domain name (regardless of the age) really depends on whether it is exactly the name they need or want for this business or personal use.

There is a place where you can buy and sell domains. It's place where people of varied enterprise converge. There are a lot of activities there. The name is Dnforum.