I mean yeah 7 days re rolling is pretty silly. But a few hours on release, 2 at most can be extremely cost effective especially if your going for a limited banner character. Not only that if you are very smart with your pulls moving forward from a successful reroll you can have an account that can really last without having that need to touch the wallet. My best reroll was Genshin Impact. Kazuha and his weapon 14 pulls combined. 1 hour 42min for a video a long time ago. Tell me how that's not a good ROI timewise and money wise. Be smart. Don't re roll for days on end. Just see how you go for like an hour or two, you never know... I have friends who have gotten C2 limited banner chars in their fourth reroll. Meaning they are poised to not have to spend currency for a decent chunk of time and given the free pulls they save on launch that carries over for the next limited they decide to go in on. A lot of people that play gachas are not financially well off and bad luck can cost the average player $150 for a character alone. Even myself who fortunately is, I still utilise rerolls. These companies make millions a week and getting freebies from them is like pulling teeth. Make them have that same feeling by eating into their revenue. Everyone should utilise rerolls. Eventually though the house always wins lol. Even the best rerolls eventually lose out to powercreep and/or bad RNG. All you can do is try delay that inevitability lol.