Thanks for your insights!!

Coinstaker shows top 10 of mining : https://www.coinstaker.com/cloud-mining-monitor/paying-cloud-mining-services/ ROI starting from more than 400 days to more than 8.000 days. That doesn't seem like a good deal.

I really was considering to get a mining contract, due to the soooo many positive posts here on Steemit, but I still didn't get one because of the Coinbase table and the thing you also mentioned: increase of difficulties in mining, reducing the revenues per difficulty level. Also, your funds are kind of stuck for 2 years, no possibilities to take it out.

In fact, in my very short experience with super short term trading, one can make a whole lot more profit. Must say, with trading one can also loose everything again when not be very very careful, ie wait until the time is there to buy/sell and spend a whole lot of hours on it (per day) and be very sensible and leave emotions out of it completely.