Okay, so I've been debating about doing one this year. I know some artists claim it's rude, and I can understand their arguments for that. However, a wishlist is just a wishlist, and to me, it's also a way of showing that you really admire an artist's work enough to let them know you'd like their art even though you probably are unable to. Now yeah some people are just greedy, and I can understand that to be awful. For me though, I want the artists to at least know that I admire their work enough that if I could afford it, I'd commission them.
but also, consider this as a feature too :) I've featured many artists in the past, and I hope tha