I'm guilty of this from time to time, but it's always based on some recipe that I know, unambiguously, has turned out well.
That said, I think it's OK to post whatever recipe you want anywhere, even if you're just goofing around with a calculator or something. The thing that ticks me off is when I search for a famous recipe, say, Janet's Brown Ale or Denny's Rye IPA, and end up with seven out of ten results being stealth adaptations of the said recipe rather than the real deal.
When I say "stealth", I mean that they name the published recipe "Denny Conn's Rye IPA" while changing stuff without mentioning the changes elsewhere. It may be a good variant, but then again, it may not, and either way it's not cool when you're trying to calibrate with the original.