As other posters pointed out, I don't think there's a good way to be consistently profitable using Nadex as their owner intends you to. Which isn't the same thing as saying there aren't ways to be profitable while still following the exchange rules.
I agree.I think Nadex offers a way of trading with unique benefits that I have not seen any other way being able to match.Some say trade the underlying but with the underlying the trader has the risk of the trade going to far against them and getting stopped out.With Nadex the trader can take a 50-50 risk reward trade(minus the spread) and the trade can go far against the trader but only has to close 1 point above the price the trader bet on the price closing above.
Buying calls or puts the price has to close much higher than 1 point to get a 50-50 risk reward trade.Selling naked options doesn't limit risk the way binaries does.Spreads can come close to matching binaries but in many cases the stock has to make a bigger move than the binary trade requires for the same risk/reward.