I don't mind that sub 4 sub exists, but I try to avoid it. I do want to promote my book, but don't want/expect people feel obligated to sub - if my work isn't to their taste then that's ok. I like honesty, so if you hate it, I'm cool with that. If you like it, and sub, then I'm over the moon.
The unpaid collab ones irk me. Anything with "looking for artist [Unpaid]" drives me nuts.
I paid my cover artist $900 USD; I paid my 'thank you' card artist $100 USD.
Both my cover and the card are beautiful. I had to wait months for the cover and it was so worth it...
People don't work for free...