Of course you can, but it depends on several factors: what is your goal in terms of earnings, how much time you invest in the game, it also depends on the type of freeroll you play, there are some where the prizes may be very large, but there are others where there are very good prizes, or if they are satellites, imagine winning a satellite for a big tournament and in that tournament you win a big prize and well obviously you will not always be able to win the same as you can win in a buy-in tournament and a big GTD prize, you must be constant, try, try and keep trying, you will not always win and there will be bad days when you play any tournament