i know i personally have bought 100gh/s on cex.io 2 different times and i have lost money both times. op is correct its a losing venture to just purchase gh/s n mine
The only time mining was profitable was way back when it first started since there was a risk whether they were a scam. They were the first to venture into cloud mining at that level and of course anything that is new to bitcoin has risk but also great rewards. I remember in 2 weeks I triple my initial investment of 0.5 btc to test the waters. All I did was buy low mine for a few days then resell. Rinse and repeat with no trade fees or maintenance fees it was very nice.