How do you feel about no rollback? I know how Hitler feels.

It is unfair towards the fair playing (paying) player. It is starting to look like it is "okay" cheat, as most problems are only half-assedly resolved. Pardon the expression.
It is way too easy to get away with duplicate items, and it is getting way too obvious to the point that even hackers think Nexon did a wrong thing when not performing a rollback.

Is there still a reason to keep charging the amounts of money we pump into our accounts?

While we pay to win, others hack to win and others take advantage of those people duping items, selling for cheap.

Exactly. I'll go a step further and say that there's no reason to play anymore at all just as well.