I've been seeing this off and on, and perhaps this is completely normal and widely accepted? But... I find openly bashing someones adoptables rather rude.
I get an artist can't make everyone happy, I also understand that man, sometimes you see an adoptable and you're just like, 'Really? People like these?' but keep that to yourself and your friends. It's really rude and hurtful to the original artist to see, 'Dude, why do people waste their money on X?/ The adoptable isn't even worth that much!/ They should feel ashamed taking that much money!'
It takes two to make a transaction. If someone wants to pay 500 dollars for what you considered a terrible investment, well, that's their deal. Not yours. Keep your complaints behind closed doors, and no one gets hurt.
And what if that artist really needs the money? What if rent is coming up, or they have bills to pay, or they owe mob boss a protection fee?
I've just seen several instances where people openly bash an artist and/or their adopts, and/or those spending their money, and while I may silently agree here or there, it is down right uncouth to be so carelessly vile.

Anyway, on another note concerning adopts.

I've received a few complaints about people being harassed about their stardragons (Let me have it, you're not using it/You're not using it properly/Hey can I buy it, can I but it now, how about now, please let me have it.)
If this has happened to you, please contact myself/Raptorslut/Deletethestars. Preferably with screeencapped proof. If you don't want us addressing the person, or bringing up your name at all to them, that's completely fine and we will not confront them. But it does help us keep an eye out for future issues and hopefully protecting others from having to deal with the same issues.