if we talk about BTG will find it a coin with few number of developers , miners and real project so if you invest on it will be so risky .
problem about you is you get bought your BTG (if you get it for free can say just keep it ) so if you need to this (390$-520$) try to sell it fast with any lower price other wise just keep it no one know what will happen in future and when you enter ICO you must loss and learn from loss
I only bought by exchanging BTC on HitBtc, indeed, I never received any BTG for free but I think that my average buying price would be more around 145-150 $ because I bought only from 13t to 18th November, so, not 390$-520$..!
I think my entry price is correct...if the value goes up again..
On the contrary if it starts to go under the 100$...but we don't have a crystal ball...
That is why I asked avises from people who knw more than me and have more experience.
Thanks