No, my question is, the ETH from cashback from first purchase, they can withdraw it or, they must use their ETH from cashback for purchase?
It's written on the terms, the eth can be withdrawn after token sale to prevent users using their cashback to repurchase.
Well, if that's the case, 100% cashback probably makes sense. If, after all, part of the tokens will not be sold, even if 100% return of eth to the account balance, then I guess it makes sense to burn unsold tokens.