Then you're good. I don't think you'll find a better-centralized exchange for Skrill. Not sure about the gambling thing though, I know a lot of exchange don't accept funds from gambling sites, but I went through
Paybis TOS quickly (CTRL + F) and couldn't find anything about the subject, so I'm assuming it's okay... but I would still suggest you read the whole thing, just to be on the safe side.