I'm uncertain about the strong form of your #2, for the following reason.
Suppose you desire to be a billionaire (and stay one -- it's not that you want to get $1B so that you can give most of it away to deserving recipients, or use it to lobby governments to improve the world).
In particular, you would prefer to have $1B than to have $0.5B in your hands and $0.5B transferred to the world's poorest people.
The thing is, half a billion dollars can do a lot of good. A typical estimate is that you can save a life (i.e., something like a life's worth of quality-adjusted life-years) for a few thousand dollars, if you're happy for it to be a life in what used to be called the "third world" and if you take care to put the money where it can be used most effectively. Let's be conservative and suppose it's $10k/life.
So our hypothetical would-be billionaire would rather have $1B than have $0.5B and (5e8/1e4) = 50,000 Africans' lives saved.
I'm sure it's very nice to be a billionaire, but damn.
Something like this sort of prioritization of one's own welfare applies to pretty much all of us, of course -- would you rather have a car or save a life? would you rather have a slightly larger house or save ten lives? etc. And maybe this means we're all monsters. But, so far as I can tell, the difference in personal well-being between having a billion dollars and having half that is really small, and the difference that money could make to the lives of others is really large, and it does seem extra-specially monstrous to prefer that really small difference to saving tens of thousands of lives.
So I really do think there's something morally iffy about a very strong desire to be dirty, rotten, filthy stinking rich, in a way that there isn't about a desire to be merely rich. Wanting to have, say, $10M seems to me morally quite a different sort of thing from wanting to have $1B.
Of course if you want to have $1B and then give most of it away then, please, go for it. As long as you select the recipients of your largesse with some care. Likewise if you have other plans for your billion that involve having beneficial billion-dollar-sized impacts on the world. Fund important scientific research, bribe politicians to do things you think are valuable, whatever. What strikes me as problematic is wanting to have and keep all that money. You don't need it that badly. Really, you don't.
("You" above, of course, doesn't mean you personally.)
[EDITED to add one more remark (because the above wasn't long enough already). I'm assuming that "want" means something like "seriously intend, to the best of your ability" rather than just "find yourself with some sort of desire". People want all kinds of things and that doesn't have much moral significance until they start actually trying to get them.]