I really don't understand what excess money would mean. For all I know, I haven't seen anyone yet who has money in the excess.
I think excess money would mean that the money has no use. I've not seen that happen yet. Even Jeff Bezoz, the current Richest man in the world still has plans for the money he's accumulated.
However, I think money makes people lose self control, not everyone though.
I've seen some persons change completely because they had an upgrade of their finances. It should never be that way.
I've said it before that that money is a tool and should be use as such. The way some people behave when their pockets are bulging with money is appaling.
Excess money, in your terms, isn't necessarily evil but it could be assumed to be depended on the mindset of the possessor.