Yes you can make a profit, but after curation it is something like between 6% to 10% depending on a number of factors, like voting power. There is an update with actual figures on the minnowbooster blog here :
"This change, combined with the minimum Voting Power of 57% will see a minimum return of 142.5% as opposed to the 171% you were seeing with the 3x model. If you assume maximum curation reduction of 25% your end result profitability drops from 128.25% to 106.875%."