There was a little handmade sign on one of the DME buses reminding people that they should tip. Totally turned me off.
That's really the cue for me that tipping isn't necessary: When a company prints up something indicating that gratuities are appropriate, then I consider it, but if it is just the service worker making up their own sign or note, I know to ignore it.
I'm going to be flamed for this, but who cares.... I don't understand why people think that a tip is necessary when someone is doing their job? Tipping the maid? Hello...they're paid to clean your room! That's their JOB! I just don't get it. And so many more people are expecting tips it's ridiculous!
I agree with you about the housekeepers at WDW. They are paid a wage, and as I've said a few times recently, it is just about the same as the custodians who clean up other people's poo in the theme park restrooms, in the heat and humidity of the Florida summer, and how many people tip
them?
However, some jobs are structured so that gratuities
are expected. At WDW, specifically, restaurant servers, bell staff and valets are paid a wage, starting much
lower than the minimum wage, because the cost of that service is to be paid principally by the patron (that's you!) We can decide whether or not we like the system, but the system is an artifact of our society, so we should be complying with the system while we're doing our part to change to the system to our liking. These folks provide you service based on the reasonable expectation that you'll live up to your side of the bargain and pay them so they can pay their bills and support their family.
(To be fair, some hotels don't work like those at WDW, and tips are expected. I can generally tell the difference since the hotels that don't pay their housekeepers minimum wage indicate on a hotel-printed card that gratuities are appropriate.)