I've found it not to be profitable at all.
The first problem I found was that in ratio, the 4CPU was farming more PTS then the 8CPU.
This is because the CPU's of the VMs arent used to 100% but peak at max 65%.
I don't know if DigitalCloud has limited the CPU useage.
In the guide is not noted that you can also setup the memory useage, which led me to the 2nd problem.
Because of the servers are located in different parts (New York, Amsterdam) and are being hosted on different servers, I highly recommend to test the different memory options.
I.e. for AMS1 I found that the 512MB option was working best while on AMS2 the 1024MB option was best.
With the US droplet test I didnt come far as the server could not connect to the debian server for the apt-get update command.
Anyways, after a total using of 20$ (a google search found me a 10$ vouche when I made the 10$ deposit), I've farmed a little less then 0.4PTS, which would give ~0.00950BTC, which is $8,30USD (trading/transaction fee's not included).
During the droplet run, I also had my own computer doing some farming in the meantime, with a avarage of 1.1 sh/m. These shares are included in the droplet test, so I was cheating in the droplets favor too.
EDIT:
I've send a support ticket to DigitalOcean asking about it and it told me this about CPU useage:
Please note that this is a shared service provider, as you share all resources with other customers.Actually a "duh". But it's good to know that a sudden CPU drop can also be expected.
Depending on your luck and/or which of what kind of other users that share the same machine as you decide your c/m and thus your sh/m rate.
EDIT2:
After this I've checked up my miners, I noticed that 1 miner actually droped in 10% CPU usage.