I feel like those numbers are a bit extreme no? It would be far more likely player B has 200-300 characters with about 50 of them being level 50 with incarnates, all ready to do the weekly task force which if using the TF that normally rewards 50 merits both players running it 3 times a day.
Player A would end up with 1,100 merits on their account
Player B would end up with 2,100 merits on their account
It shouldn't matter what they then go and spend it on, the matter is player b has a much higher reward