Loyalty points can be combined through the companion that can’t be otherwise.
Promotions are offered and there’s a PIN (combination of letters usually) that you can retrieve from the companion to claim special match bonus offers if you’re eligible.
Personally, I login when I need to but don’t keep it running otherwise. For some reason my CGB isn’t working at all and I get $0 in Balance and 0 in Loyalty Points and it won’t hold my address info. either. The other casinos are fine.. but Grand Bay isn’t working right for me.