I couldn't sell IOTA if I wanted to - it would probably get stuck in the middle of me trying to transfer it back to the exchange.. either way I'm holding on to it as long as the IOTA foundation doesn't decide to abandon it and run - it is the absolute best coin "on paper" as of today.
it's one of the most promising coins in terms of future, but far from best on paper. Take a look at byteball (which is also DAG) but with better tech (but bad marketing) and skycoin (which is on blockchain but also with no fees and no posibility of 51% attack). There are also quite a few gems out there if you are willing to dig deep in the whitepapers. It's just that speculators don't always see beyond marketing