IIRC I was against having an RPotM concept back then and I'm still against it now, mostly because I've been in PWs with that system in place, and if it's run by DMs it inevitably leads to DM favouritism, and if it's run by players it becomes a popularity contest.
One player may be selected, but what about the other players who roleplayed just as well as the winner and didn't make the cut because they play during off-hours or were under the radar in some way, they're not well-liked by the people voting for them, or something else? Why don't they deserve the award as well? Why are they disqualified for factors that have nothing to do with the quality of their roleplay? You can say "we can have multiple RPotM winners, then!" but in order to nominate someone you have to know about them in the first place, so people who don't make a big brouhaha will still be left behind.
Finally, how do you even begin to measure "quality of their roleplay"?