4. I have over 500k UR sitting and don't currently have the opportunity to spend it on travel or vacation.
How soon are you going to find the opportunity to spend your 500k UR on vacation? Maybe cash out for $5k and invest the proceeds. If we're talking 10+ years, you need only a ~4% return to make 1cpp in cash today equivalent to 1.5cpp for future vacation.
Or sell for >1cpp if your Rabbi, Priest, or ethicist permits it.