The reason why you cannot find many people who made ROI is simply because GM has not been around for that long. Only a few people who were there from the absolute beginning might have made ROI by now. I'm on about two thirds, having started nov/dec 2014, pretty satisfied with that.
Sincerely GL with DMD Ivan, it's great that people who were there early and helped it start up made a good buck. I'm sceptical that it will stay that way but who knows! I sincerely hope it does for all those involved.
When I first heard about GM they were selling Scrypt contracts where the hashpower was tied to GPUs.
For myself to purchase GPUs that mined at 1MH/s Scrypt would mean buying two of them, in Europe if i bought GPUs to mine BTC it was costing me about 400 USD for one card that could mine at just over 700 KH/s. Then to get two would mean beefing up my PSU to over 1000W. Expensive stuff.
The prices did lower when Asics started coming out about late April, May time but even then compared to the prices in November these were pretty expensive, but that was based on the miners at the time. The first Asics were pretty power hungry and had capacities like 40 - 80 MH/s. They cost a lot of money too as they were in demand by everyone.
The scrypt mining difficulty shot up because of all these Asics, so over time the payouts lowered as well. Then other companies came along like GAW miners etc offering Scrypt hashlets for half the price of Genesis Mining and if you go back to around that time, plenty of posts from users complaining about GM's expensive prices when GAW miners was so much cheaper.
Thing was..GAW Miners were charging a daily fee as well...GM was not.. But GM in the end had to compete, they were losing customers and this is why I think in September they introduced the new lower priced contracts with Maintenance fees. Looking back on it, was unfortunate because we all know what happened to those contracts from all the Scrypt mining companies that introduced a maintenance fee, GAW Miners did it,, well we know what happend to them, Zeushash, they had to shut Scrypt down in December and GM, well they managed to keep going and then had to concede defeat in February.
They hung on longer because unlike the others they tried to help their users by lowering maintenance fees as much as they could possibly go without it hurting their own business. GAW Miners promised that their fees would lower over time..Did they?? Course not....They lied..GAW miners never changed from their 8 cents per MH/s fee, GM lowered it over time from 8 cents per MH/s down to 4 US Cents per MH/s
IF GM didn't have to do what they did because of competitors eating up all the business, they could have still sold their Scrypt contracts as they did with all fees included in the price then they would have been doing quite well over the early months of this year as nobody else was mining Scrypt. Difficulty fell, the amount of Litecoin etc you could have got each day would have improved but unfortunately GM like all of us can not magically turn the clock back.