1. Why are assuming that UBI would be paid for by individual income taxes?
2. Yes, no matter what, the richest people are going to receive so little benefit relative to their wealth/income that they won't support it. The same is true for most public services, actually. The ultra-wealthy receive little-to-no direct benefit from Social Security, Medicare, food stamps, public transportation, public schools (big one), public universities, or even public police and firefighters (they can afford their own). But somehow they haven't (yet) managed to rid themselves of these horrible violations of their privilege.
2. Yes, no matter what, the richest people are going to receive so little benefit relative to their wealth/income that they won't support it. The same is true for most public services, actually. The ultra-wealthy receive little-to-no direct benefit from Social Security, Medicare, food stamps, public transportation, public schools (big one), public universities, or even public police and firefighters (they can afford their own). But somehow they haven't (yet) managed to rid themselves of these horrible violations of their privilege.