Anyone ever sell their submarine house (or let it expire worthless) and regret it?

I've got half a billion gil that I'm pretty sure I'm never ever gonna use, and yet I am still compelled to resub to this game even when I don't want to just so that I can keep accruing gil that is worthless. And 100mil is only like $40 anyway. My subscription to maintain my submarines would cost more than the equivalent RMT.