Looks like another reason to be hatin' on Curtyards.

I've never seen a tip envelope, but maybe I just never noticed while moving all the stuff aside so I have room for my laptop and phones.

I'm a low maintenance guy. I use one towel and one hand cloth. I tidy the room up before I leave. Why should I tip, unless I requested some extra service? The only time I request something is when it's missing. I'm certainly not going to tip when I receive something that should have been there in the first place.

The little note cards signed by housekeeping always seemed to me to be like an "Inspected by #9" kind of thing.

I tip my car service driver, shuttle drivers that help with bags, bell stand folks that hold my bag or shipments, the Lounge attendant if they have a plate set out, etc.