I have heard about the limited TIF as well from our CFI for raaus. Has potential. I think the GFA has something similar with Air Experience Flights.
For us, where I am a member and fly, we are a volunteer club, and instructing is not every day of the week, 2.5 days at most for raaus, gliding is a little different. We are more word of mouth for raaus, as we are after club members. We are also a gliding and raaus club, so we have instructors covering each type. And most instructors are retired and those who are not, it is a every second weekend thing or so. For me, it will be a 1/2 day every 2nd week.
Understand those doing it for a day job, yes you have to make a profit to make it viable. I just want to see more people, and young people getting into aviation.