Sometimes people are so "worked-up" over the issue that brought them here that they just don't think to utilize the search feature, and I don't think it happens just here on FT.
As an example, I regularly visit/post to a timeshare board and it seems that several times a week a new poster comes on and asks "I just purchased a great timeshare from the developer...., did I get a good deal" and the anwser about 99.999995 of the time (if not more) is "no, you got hosed, recind immediately."
People are looking for a quick answer, and might think that there are 1,000s of people logged on at any given moment waiting to answer their question; also they may think their situation is unique and that prior answers may not really apply.