I'll likely catch some flack for this one.....
WDW Mousekeepers are wonderful people - but they are sort of in the same category as all the folks in the world that have to clean rooms

. It's not a career that returns a lot of cash, in terms of salary.
Now- Disney will tell you over and over that you don't have to tip anyone. I love Disney - but I call bull feces

. All that follows is personal opinion, and 12 years of experience....
TIP your Mousekeeper. Help that person make a decent living. Then watch what happens to your room, beyond basic Disney standards. Really - with any service staff (restaurant, hotel, cab....)? Our behavior is to create a relationship - one that insures exemplary service. Tipping helps - a LOT. And it's not because anyone is greedy.... they just need to feed THEIR family

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