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There's a finite amount of years in a life too. The question is whether the paste runs out before your life does, and this is simply a question of use rates.

I have used maybe a millimeter of the...

You don't even have to be creative with the accounting.

Initial cost of using a pasted paddle:
$30 for paddle, $8 for tube of paste
Incremental cost of refreshing a paddle:
$0 - the tube is...

It's cheaper than sandpaper or a lapping hone, even for a lifetime supply.

I don't see it - it only takes a few minutes to repaste a paddle. Hones don't stay effective forever either. They need lapping periodically.

It's not a binary choice - there are lots of options, and pretty much all of them work well. Shaptons, barber hones, PSA sandpaper, etc.