I enjoy this event because I have plat, I'll make a ton of cash, and in that I hope you change nothing, but if your goal is for a f2p player to get 5000 tokens, that is still a bit out of reach, I'm on (day 3?) And still not yet 1000 tokens. I'll still play the event, get as many as I can, but 5000 is probably unrealistic. Madlur spawns just not frequent enough at higher level , and at lower level he spawns but never get more than 20 tokens.
Wish there was a Elixir for higher spawn rate at higher level.
Till then I'll sell low level elixirs and occasionally run a higher level for a few tokens.