Why do you all have to make it so complicated:
If you are a PPL you must pay at least your share of the flight, there are a couple of exceptions which don't apply to most PPLs, ie. Glider tug and Para drop "clubs"etc.
As FL states most pilots just want to keep out of trouble with the CAA, so instead of some of you looking for the loopholes, just find people to fly with and keep it legal.
Tony