I gotta agree w/ tetsujin here. A good model is a good model, no matter how often one posts on a site.
If they gave prizes for some other purpose or agenda, well, that's their prerogative too.
I used to play the Contest Game a few years back, where you study a contest to see what they want and then build to that standard. Every one of them is different, and every one has it's own agenda. That's not bad, it's just the nature of the beast.
The only time something like that makes me mad is if I paid money to enter. I got shut out of a figure painting contest once for being "a professional".
"This contest is for amateurs and hobbyists, not for some ringer to come in and scoop up all the prizes!" they said.
Now I appreciated the "compliment", but I certainly ain't no professional. So I demanded my money back, and never went to that show again.