The best solution is a positive feed back section. This will identify trustworthy sellers. Also, dont buy a pigeon if you are suspicious!! Ask for more details, ask for pics, ask for his tel number, etc
I'm only aware of one 'con artist' on this site and he was found out (coxy) so your making 'mountains from molehills'
genuine sellers should not be 'tarred with same brush'
I have had nothing but praise from the fanciers i have sold pigeons to, and I thank them kindly,
Easy solutions my friend........