Well, considering average player plays his class far from optimal, I fail to see how they would clean 25-man DS heroic in their average gear. And even if they somehow manage to do that, by cleaning DS with one character you will achieve too low gold monthly to pay for token.
Also, you're seriously deluding yourself if you think you're an average player while you're a multiboxer
Multiboxing - hell, even for me it is an unknown territory, and I am playing this game for almost a decade! I gave you a very precise portrait of average player, believe it or not. Average players do not use any of internet guides, even in form of Facebook groups. They can ask in trade or LFG chat ingame - once - but they immediately get harsh yet so truthful answers like "nub go read wowhead", so they won't ask again - and neither they would go and read wowhead, sadly