It's nice to have an option to not age and die, anyway. We have no idea what the world will be like in a decade, let alone 5000 years.

> I love peppermint ice cream, but I'd probably get tired of it after a million gallons.

So you'll take a break. Then you'll crave some more. The problem with suicide is that one can't change their mind, because there's no mind any more.

> A thing in infinite supply has little value. Why would another year of life be any different?

We have effectively unlimited supply of water, yet it has a lot of value to us because a person can't survive without water.