Finck cheated himself(and GNR) out of fame and fortune. He left the band on his own and instead of helping Axl get ready to promote Chinese Democracy, he was partying with NIN groupies. Hell, Finck hasn't even made a comment about GNR or Chinese Democracy since he's left, as far as I know. This proves he doesn't give a fuck.
THIS.
Robin Finck abandoned GnR just as the album was coming out, without giving Axl or anyone else in the band any warning. Why? For a Nine Inch Nails anniversary tour. The band couldn't tour without him, and everyone in the band has said repeatedly that he never gave them confirmation of whether he was treating NIN as a side project or if he was actually leaving Guns N' Roses.
All this time, instead of treating GnR or it's fans with some respect by simply stating what the fuck he was doing, he's been out on cash grab NIN tours and fucking around at industry parties.