When I sell my COINS, I get at least 30% of the profit, but it depends on what everyone thinks.
When you wait for prices to rise further, it may eventually fall back again, so it must not be greedy.
I think 30% is a good ballpark expectation. It depends on the coin and its potential. Some coins can give us better ROIs, some already can't even do 10%. Thats why diversification is important.