I really like how their operation cost is only covered by tips instead of a cut from donations like most other charitable organization. Not sure if they are first to do that.

I'd be curious to know what the average tip is.

When I give tips at the restaurant or the car wash, the more I give the better I feel about myself, it's not only a reward for the quality of the service but also the feeling of helping somebody who needs money more than I do. There's a little bit of charity in every tip, at least for me.

In this case the physiology is reversed. I'd rather donate more to the patient and less to the institution. I also have no reference of what a good tip is for Watsi. It would typically be the minimum amount to keep them operating and donate the rest to the patient.

Should they add a suggested tip?