Duplicate of https://freestylersworld.com/showthr...the-event-shop (which is already in "to be added later").
Looking back a good price point would be 100-200 event points, for permanent items. I don't agree with the argument that items should only be rentable because after people get them they'd stop playing events, as at the moment event points have no use other than for transferring them to a more useful currency, coins, which they can use to buy permanent items, and then stop participating in events once they have those donation items if they wanted to.
I can tell from my own perspective and have many friends which feel the same, that the only reason to join events for those players and I is for fun, because we REALLY don't need event points for any purpose.