Quite a bit closer. And in fact, it shows that more people tip housekeepers, then do not. That's pretty definitive.
I'll just leave this quote here from the LA Times article.
"There is no consensus among Americans travelers about which, if any, hotel staffer should get a tip, according to a survey commissioned by the travel company Expedia.
The survey of more than 1,000 American travelers found that 30% don’t tip anyone at a hotel. Of those travelers who do tip, 46% say they tip housekeepers, 40% tip room service attendants, 30% tip the valet, 20% tip the porter and 10% tip the concierge, according to the survey."
Read carefully..of those who do tip! So those who do tip 70%, only 46% of them tip housekeepers. So about 35% of everyone.
So to each his own on tipping but a societal norm it is not.
Personally until probably last year until I saw a thread on this board about tipping mousekeeping I didn't know it was a thing. I'd never heard of it, never seen an envelope and never even thought about it because they are paid a salary, don't rely on tips, and don't really do anything above and beyond their job description.
I don't have an issue with tipping and actually rarely tip less than 20% at a restaurant, but servers make less than minimum wage with an expectation of tips
I posted a question many pages ago that was left unanswered. Are mousekeepers even allowed to keep the tips? As a former watercraft employee accepting tips was a fireable offense unless you immediately turned it over to your manager.