You're essentially betting that you aren't going to find any fun, useful, enjoyable, or otherwise worthwhile uses of money.

No, you're betting that you aren't going to find enough such uses for enough money to outweigh the benefit of having hugely more leisure time.

I can think of pretty good uses for a near-unbounded amount of money (more than I am ever likely to have, alas). I can think of pretty good uses for a near-unbounded amount of time (more than I am ever likely to have, alas). Working full-time, working part-time, and not working at all (note: by "working" here I mean working for pay) make different trade-offs between time and money; none of them implies not having any use at all for time or not having any use at all for money.