For long term, imagine that one day the markets go against your moves, and without setting the stop loss you may end in a bad lose. Of course, that sometimes, because of some ticks closes the transaction on stop loss, but I believe for the long run, better to have a position where you know how the trade might work out, setting a take profit and a stop loss. Before entering a trade, we need to know why we enter the trade, and how much are we willing to lose on that trade.