I'd skip a second portal. It really does take SO long to recoup that energy expenditure. Unless you have a bunch of unicorns that are spitting out gold coins, you enjoy the hunt that you save up energy specifically for THAT, you don't have any more story lines or you don't have anything else that interests you then sure. In my opinion, I semi-wish I'd never bothered with the first one. It'd be better to use energy towards adventure gems for another Flower Power alicorn during a sale.