I have not mined a crypto-currency in a long time but.
When the GOLOS public GPU miner is finally released. I plan on building my most powerful GPU mining rig so far. Since I own about 10000 GOLOS it will be in my interest to run the difficulty up as high as possible with no concern for ROI. Thus I expect my ROI to actually be very high due to my constant rig expansion. I will post part 1 here ASAP.