This seems like an interesting way to keep the incentives more aligned.
Personally, I wish there was a more socially acceptable way to just rent space at a coffee shop. I don't drink caffeine and I often need to find a place to crash for 2 hours which means either I buy a high calorie pastry/juice that I don't really need to be eating or I feel like an asshole the entire time I'm there. It'd be far easier for me if I could just drop $4 in a jar and have that cover my time.