I didn't start buying at $10 a coin. I started mining at around $250 a coin . But regardless, had I bought several at $10 a coin,
(Oh how I tried, but gave up in the end...skeptical, scams etc...)
I, like most other sane folks (who did the same but succeeded), probably would have dumped most, if not all, at $100 a coin. And would've been quite happy about the profit.
(then shortly thereafter, kicked ourselves for not being psychic)