Probably Wario realised if he goes on the good side, he'll have more money.
So, generally saying, Wario is still the same ol' Wario, except he has a new method...
Waluigi, being a 'new' character and all, probably hasn't realised that yet like his brother Wario...
I am a pure Super Mario lover!!
...and in no point in the future will he ever be abandonded by me!
I will even drawn the best Super Mario comics ever to exist!!