Are you tracking people whether they are hoarding their merits or not ?
Unless you are using bpip tool to monitor different users on the forum it will be really difficult to tell if the people are hoarding their merits or not.
Besides that, if people are hoarding their merits then there is no point of it because we don't have any kind of benefit for hoarding merits.
It's better to give it away which is it's sole purpose anyway but then again we have all the rights to choose whom to merit.
Even I become really choosy when it comes to meriting posts but because I have only a small amount of merits with me.