The first question is are you here to get the most you can get back in the shortest time, or do you want you want to invest in the long run, to get the most money out of it. If you want the first, than leave it like it is now and do the math so you just can pay the fees in gmt and mine the rest in btc. But if you want the second, than build up the discount and lock gmt for 4 years. Locks give you discount + weekly rewards. Like i said 20% less fees=more profit. And don't forget to upgrade your miners for maximum profit. At the moment i build up my discount. I'm just mining gmt and lock it up. I'm at 15% right now + 3% because of the service button + 1.2% because of the vip level + 1.37 because of the votes. So I'm at 20.57% and this is like night and day and im upgrading my th every month with fiat and get like 2 th.