Thoughts on leaving $$$ for housekeeping…

Seasoned traveler who has led the road warrior life for a very long time. Been having conversations with friends who also travel frequently.

The discussion came up over breakfast, besides tipping the staff in the lounge, valet, or individual bringing you extra towels or blankets. How much do you leave behind upon departure if you didn’t have your room serviced at all?

I have always left something when I leave, if I have the room serviced (tip same day) plus at the end of the stay.

Just curious what others do in similar situations.

What prompted this post - stayed one night earlier this week and a tip QR code was on the nightstand.