Please let us know what kind of business are you trying to buy. I also suggest that you check out sites that can give you some important contact info re this business like Whois. From there you can see whether this business has been running live all this time or is it just a fly by night one. You can also do a quick search on your own.

I was thinking that if that particular business is for sale, I'm sure the owner has kept a track record of it. Why don't you check that out and see if it's worth your time and money.

Why are you interested in buying it anyway? Is it really earning much? Is it that popular in the WWW?