Would it be worth trying to level up pets before selling them to get more money or do most people pay attention to looks more than levels (not me trying to sound rude because I do this XD)

levels are only likely to impact a sale at all is if the pet is lv61+ (since the only time you can catch one and have retain the level is those caught in a fest zone)

people are more likely to make their decision to buy a pet based on:
Stats (higher = worth more)
traits (what traits are vis/hidden/carried, number of vis)
theme (if themed, what theme?, Tagged / PB / not themed?)
regennable? (and if so, what kind of regen)
colours

I have never bought a pet for its level- it's easy enough to raise a pet's level with a bit of time (it's just 61-70 that take more time, but since if I'm raising a pet it's usually to join our ranks of lv50 Contest Board battlers, that's not really an issue)

Okay, thank you! I'm trying to level up pets for missions, so I was just curious if it was worth doing all of them or not