I can imagine a 150-year lifespan being preferable to 75; 300 to 150; 1000 to 300; etc. And even when the numbers get very large and I cannot imagine the longer lifespan being better, I chalk it up to my weak imagination.

Very large but non-infinite numbers are more likely to be what's on the table, I think. Given that something is likely to catch up with a future human society, even one capable of reviving frozen people–even if it's just the heat death of the universe.