I advise you to try mining BCRM (a bitcoin fork) it's easy because I am mining it (lol)
You count the BCRM you mine in one week...
you estimate your cost mining with you GPU one week.
So you know exactly the price for your BCRM mined.
The you go on the only one exchange place
https://winspiral.com and you compare your price with:
the buying price and the selling price on winspiral.com site.
If your price is less than the selling price than it is perhaps interessting to sell and you will make profit.
If your price is higher than il is more profitable to buy them and not mine...(let mine the ones who mine for less than you)
But do not forget that if you mine the price of the mined coined goes up because same number of coins are shared by more miners.
All you need is a BCRM address and a good GPU and you can at the moment sell your BCRM for 0.00031161$
Do not wait till the BCRM will be more popular...the secret is to be in the race so long the price is going up...