Are we all really sure that this is not legal?
To everyone else,
What if the club "give" a ppl member the use of the aircraft free of charge, to show new members what the club has to offer. The Pilot has no need to pay half of nothing.
Rwy pays his club membership for a year, or whatever, and the club stands the cost of 20 minutes airtime and a landing fee, out of either what Rwy paid them or they take it on the chin as an introduction investment in Rwy with a view to getting his long term custom.