Why on earth is everybody trying to monetize IPv4, i.e. make RIPE fees dependant on IPv4 ressources?

I completely fail to see why anybody should pay more for HOLDING any number of IPv4 ressources (or other ressources, by the way).

It’s a different story for ressource transfers. So let those selling IPv4 pay a fee for the transfer! 

And for the rest let’s stick to a real membership fee: one price irrespective of which services you use or not. The fitness center doesn’t charge you per minute, nor per device you use. It's a flat membership, full stop. Hopefully low enough so it doesn’t create a problem for anybody's bottom line.

Cheers