I do not want to devalue my current points of happiness.
I think this same thing from a different perspective: I do not want to become the person who takes all my luxuries for granted instead of always being conscious/grateful that I have somehow managed to wind up with this awesome life.
Ex: My mom and I both travel and both are Marriott whatever. She travels extensively so is top-tier whatever, and so she routinely gets upgraded to the best room without even asking; I travel less, so I do not. After years of this, I've observed that it now takes more to provide her the same level of happiness. If she doesn't get the upgrade, she's actually unhappy; a basic-level upgrade is now the baseline expectation, and it takes something like the Presidential suite to make her really excited. Whereas I'm still thrilled with that basic-level upgrade.
This is where I can see infinite money creating problems. I have really, really enjoyed getting to the point I can solve some problems by throwing money at them. For a very long time, that wasn't an option, so just sitting there, looking at a problem, and knowing I have that choice makes me feel like I've succeeded, like I've really come a long way, and I'm both grateful and somewhat disbelieving that this is actually me, sitting here, able to be frivolous with money if I want to.
But I don't want to become the person who thinks that my money will solve every problem for me. Because of course it won't, and so I will be disappointed when I find a problem that I can't solve that way. But even more, I will lose the joy that I currently get just from realizing that I
can solve my problem in that way -- I'll take it for granted because
of course I can solve the problem by throwing money at it, because I do it all the time, and that's my baseline expectation now.
tl;dr: I don't like people who take their good fortune and privileges for granted, and so I really, really, really don't want to be tempted to become one of them.