So some sneaky things that happen in Vegas.
...
One thing that i had to learn from a co-worker who just happened to be in Vegas while I was there was I'm supposed to tip housekeeping.
I'd never heard that before, and at the time, $2/night of your stay was deemed customary -- so I was told.
Since then, I've noticed other places in other states had cards out recommending tips for housekeeping.
So, if I tip them after I've checked out, I get no benefit -- no extra service for my generosity. If I don't tip, there's no possible way for them to retaliate (like the bellman you mentioned). Seems like a waste of a good tip when you get the service you get whether you tip at the end or not.
I mean, how many ways can housekeeping go above and beyond if you never see them? I'd tip if they left extra towels or soap in response to my request, or if they cleaned the room or turned it down at my request outside of normal hours for those services. I've slept in after a really long 2 days of no sleep and called housekeeping to arrange cleaning after I left for dinner. I tipped $5 for that.
If everybody tips everybody, then the size of the tip can be smaller per tipper. The person gets enough tips in an hour if they work hard. But the way tipping works now, the good tippers are merely making up for the bad tippers. Unless you leave an extremely large tip, it usually goes unnoticed as "what's expected".