Mail Inclusive

Hello! Been in kpop for a while but new to mailing trades/sales so I’d like some opinions Is it expected to have inclusives like lomos and stickers when doing a trade or sale? In my personal experience, I have received mail with both freebies or none, and neither have really bothered me since the actual pcs came in great condition. But since joining here, I’ve been wanting to get more serious with this side of the hobby but wasn’t sure about this aspect