That's a real positive thing to say. Why are you even here then if this forum is worthless? As for the tool, yes it's just an estimate, and is really just for fun anyway. We can bring up silly things and still have a valuable forum. Relax.
Stick around this forum for a while and you will see lots unsupported, subject answers to objective questions. Ask a question like "are underscores and dashes viewed equally by Google?". You will get 10 "well I think" for every "here's a link to a study on the differences". Valuations is another issue where we can go research and not just have a bunch of kids saying what they feel. Valuations are also a bit of a bother to me because webmasters are selling themselves short when selling for a number of months worth of revenue rather than doing a discounted cash flow analysis or some other valid valuation. On the other hand, it allows me to buy websites at one fifth or less than there true value.