depends, personally i have three class's class item, want to switch allegiances until i get the other possible six, ie 3 for each char, unfortunately without old nightfall/bounties going to faction only it'd take forever, only have about 700 motes and 350 coins so wouldn't even reach rank10 on One new allegiance that route, it was ok getting them shortly after TTK landed, novelty's worn off alas, so short answer to your question, not really worth it 'atm', long answer, yeah, who knows how it'll change in some future dlc/update so having high/at least lvl25's in factions could be a good place to be, fingers crossed.