Nice suggestion, GimpKnowHow, however, any option, whether it be vote or by thanks, people can spam accounts to vote or thank themselves. So if this idea were to be implemented, there might need to be rules, like, MOTM has to at least be a junior member and anyone caught spamming accounts would be forever disqualified from MOTM, etc.
My only thing with voting, is that it would be a popularity vote. I think that thanks is a good idea, because then it promotes members to be more actively helping one another, rather than trying to be as well known as possible to have votes.
Anyway, that's my 2 cents.