If someone's business is making or selling bumber stickers, that two word domain would be valuable get. Most likelly the other TLD's cost more or were not for sale. I don't think that is to high a price for that domain in comparison to other promotional costs. A person in the business might pay thee times that for a one time trade show booth, yellow page ad, or magazine ad. I'll bet the domain makes them many times that with the value of the generic name for that specific business. It's the kind of business that there are probably thousands of small companies doing, that makes the value larger due to supply vs. demand. I disagree that bumperstickers.biz was a high price, but I do agree that creditreports.info at $1500 was a steal in todays market.