But one of the main reasons why money is awesome is because spending money is rivalrous. My primary expensive hobby is art collecting. I have the number of original paintings I have because I put up more money than the other people bidding on them, and if everyone had more money, then the primary effect would be that the prices increase.

This assumes that a) there is a fixed supply of original paintings, and b) the demand for original painings is income inelastic. Admittedly, I'm not an expert on the art market, but my intuition is that the opposite is the case on both counts: as incomes rise, I would expect people to spend a larger percentage of their income on luxary goods such as art. If this is the case, then, yes, everyone having more money would indeed cause the price of original paintings to go up, but they would rise at a faster rate than less elastic goods, which would cause production of said paintings to go up, which would drive prices back down; the net effect is that more people have more paintings.