The whole tipping thing is just so confusing. I am actually seeing more and more instances where hotel or parking shuttle bus drivers are not tipped - even after helping people with their bags. In Taiwan, where tipping is not the norm, they are trying to get the tipping thing going at hotels.
I too keep my hotel rooms tidy - I actually clean up a little and return things to where they were when I check out. So, unless it is very high end hotels, I don't tip anymore. I think they should tip me for making their lives easy