That's not a consumer problem,if you have plants that look crap i cannot understand why i should buy it. A greengrocers with crap vegetables will throw them away as none will buy it,or at least will put a good discount on them,i cannot see the difference.
We surely don't live in a perfect world but we have some good rules,one of them is that when you buy something that you cannot physically choose you should be able to see a photo of it and if what you recive isn't what you bought than you can have your money back. I cannot see why rules that are applied to every online shop are not valid for online CP vendor.
There's only a name for selling crap plants insted of the healthy and good looking ones on your website and it's fraud.
That said mine is only a general speach,i never had any problem with any online nurcery,the only times i recived crappy plants i got a fast refund,but it'll surely be better to see what you're actually buying,maybe asking for a photo before the payment,so the vendor doesn't need to upload loads of pic on his website
Luca