I think i have tried this weekend gap strategy before, yes it was very profitable although you can only trade maximum 4 times a months, sometimes even lesser or no trades at all when the gap is below requirements, but over time brokers started not to honor the gap trades, so all of my profit made were deleted and they created a new trading rules that the order/trades within the weekend gap will not be honored, so there goes my weekend gap profits.
There might be some brokers who accept it but i didn't have the time to look and test new brokers, i am happy with my other trading system results already. 🙂