Yeah, I personally wouldn't spend any money on this. And won't. Being a F2P player feels so great when you manage to keep up with the P2W players. lol. That 500 gold you get for inviting friends, spent it on card reveals, used them in the gacha, got redundant cards. It honestly feels better using card reveals you earn from events and just guessing for the SRs since you're not wasting anything just guessing. I do understand wanting to spend money for the event gacha, but ever since I discussed with the developers about how hard it is to get SRs you don't have, I've been contemplating whether spending even 3 dollars is worth it.

Luckily that discussion was a few weeks ago and haven't thought about it sense. Just got Runa Kamiwano from guessing. Felt happy. Still missing like 19 cards but I'll get them sooner or later, no use in spending money to speed up the process. More fun to me that way.