EP. The EP-pack would be an ingame, tradable item sold in the Perpetuum webshop, and should be two types of them:
First - give "extra EP until caught up to Y% of the current maximum EP a player could have (so this would be a rolling limit). For example if the maximum amount of EP any player can currently have is ~1.000.000, these packages couldn't be used if a player is over... say 250.000 EP (25% of the max)". Or may be it would have fixed limit (within 150k - 300k EP is quite objectively). I think it should have 10000-20000 EP each
Second - give extra EP until caught up to the current maximum EP a player could have. Of course it will be much more expensive, for those people who want to donate this project.
Another idea with EP-packs.
The EP-pack would be an ingame, tradable item sold in the Perpetuum webshop. It have 20000 EP and its price 5 USD (43200 EP for 30 days, and subscription costs about 10 USD). But when player activates this EP-pack he will receive 20000*(M - c/M) EP, where M - maximum amount of EP that any player can currently have, c - player current EP. For example if the maximum amount of EP any player can currently have is ~1.000.000 and a player have 250000 EP, activation of EP-pack gives him 20000*(100% - 25%) = 20000*75% = 15000 EP, and less and less with each subsequent activation. IT MUST BE ACTIVATED BY 1!
Also can make 40000, 80000 and 240000 EP-packs which prices are equivalently 20000 EP for 5 USD but more valuable on ingame market.
