Leverage sure is a double-edged sword, but without leverage trading would not bring in any scalable results. That is unless you have heaps of money to invest. How much would a movement of a few pips give on 3 or 4k. That also might be considered a big amount for a lot of current investors in the market. Considering most are part-timers, and some even college lads.
Had it not been for leverage, I would have stopped after meagre earnings. Still trading solely because of high leverage.