For me its a great event, but it has a lot of dangers people must look out for.

Never go ahead if you don't have engough tokens to clear the next red card, by the way that costs 5, 15, 30, 60 and 120 tokens ussually i stop there, but if the profit is high i keep on and then the values are about 250, 500 and 1000 tokens.

For people with less than 500-1000 tokens in their wallets i think its really not a good event and the aproach people are talking about in the previous posts of extreme caution is the most advisable.

If you have 1000 tokens and don't mind to loose some 200-300 then risk it, in the higher levels you get purple cases, playstyles, lots of white ability boostes, tokens and green packs, manay time well worth the tokens spend.

But go ahead with caution allways accounting your earnings and losses.