If I understand correctly, the aeroplane doesn't have to be very high performance to be incompatible with UL91. I would be delighted to be proved wrong but as far as I can tell the PA28-161 that I fly from a club may not use UL91.
Yes it would be nice if club rental aircraft were not generally so old and horrible (although I was lucky to find a club that has aircraft which are old but very tidy and well equipped, it can be done) but where in the new generation stuff are four seats and approval to fly night and IMC? (Genuine question, I don't know the new aircraft market).
Also of course is it any surprise that clubs and schools run knackered old kit when people whinge about a tenner to land and post questions along the lines of "Where is the cheapest place to learn to fly" rather than "Where is the most suitable place to learn to fly" or similar.