I'm not sure it was a dumb idea - If I had one of these lenses, I'd post up... what I've seen before along these lines are threads titled, "Show me your F/FA* 300mm photos" or something similar.
Another handy resource for making yourself drool with lens lust is the pbase camera database. Check out the
Pentax page at pbase, and you can link to hundreds of F/FA* 300mm photos (down toward the middle/bottom of the page).