PCers are most likely cheating on the downlow but getting away with it and show off in public on Neopets. Usually PCers are the ones that come to your user profile and see if something dodgy is going on with your trophies, or other collectables and will report you if they feel jealous. Once you get reported the TNT team will be forced to look into your account closer as a whole and either they correctly find you have been cheating, OR you get unfairly banned if you did not actually cheat.
So avoiding the boards and not participating at all or having your name not show anywhere on there at all is the best way to stay safe on neo.
Our community here isn't like the ones you'll find on the neo boards. We are just here to have fun and collect the stuff we want because we enjoy collecting and it's less about our ego in the neo boards. We also don't give a shit about who cheats behind closed doors, and we also want to keep our neopets accounts anonymous too. Because there's been instances in the past where TNT or PCers have tried collecting people's neo account info through all means they can, including cosy up on here.