Hi clawindsouza,
I have several different platforms scattered around still, some tracked to PokerStrategy, some not (held prior to joining).
Whilst I tend to visit 3x regularly, it's still sometimes useful keeping the others open as they all set up promotions & freerolls into live events etc occasionally.
Obviously if you're not going to play on a certain platform for a while, then it pays to transfer any large amounts of money into your more active platform, but if it's only a couple of $, then no harm leaving them (except Partypoker who will charge a small fee on inactive accounts).
Best regards,
Bart