For a cult founded on money and sex, and judging by the massive amounts of wealth the Romney line has pumped into the religion, way above the 10%, I would guess that the money buys a lot.
In regards to temple membership though, and qualifying for becoming a god, it is required that you give 10% of your income, and the amount doesn’t figure in, just the required percentage.
You are checked out on this during the vetting process of earning temple membership, which allows you to switch from attending the plain, church like buildings, to attending the glorious temples, and partaking in the secret ceremonies.
They aren’t just members of the same religion, they are members of the same elite, holiest, inner circle of that religion, members who share the inner secrets of the temples, secrets unknown and forbidden to lessor Mormons.
Your last paragraph pretty much describes the Romney campaign.