Well then, if paypal is to much trouble, then why not pay safe, google pay, or any of these account related prepaid options?
I mean, I understand the logistics of it, and the cost/benefit trade-offs, but at some point to be able to grow more you'll have to pay more.. like in any other business.
anyway, as a business you should always be striving to grow, and to actually make a name for this kind of games, it would be advisable to milk less and evolve more, meaning making difficult game mechanics that are challenging to complete, but not completely dependable on the "pay to win" strategy!
I've noticed on several occasions that events are heavily dependable on the kobans to actually gain the higher prises... or that to actually gain kobans playing, you need to spend kobans, more often then not, more then you'll make back.
all in all, it's a nice concept, but milking the players will drive them away, so it would be in your interest to actually engage players, specially now that this genre is growing and a lot more options are starting to pop out!