So if it does "go up there, in flashing lights", how about an easy link to set up a regular direct debit? Call it a voluntary subscription, if you like.
Now it doesn't have to be off putting when you think of the potential numbers involved.
42,000 members of which perhaps(BIG GUESS)50% are U.K., and say(EVEN BIGGER GUESS) 20% are willing to sign up. Then according to my questionable assumptions, a meagre £1 A MONTH would add
£4,200 A MONTH!!!!
Maybe i've over/under guessed, whatever, the sum of £1 a month isn't going to be missed by anyone, and if successful would give the PPRuNE Fund considerable clout.