Absolutely, thats totally fine. As long as you can view the coins you have invested in as "free" (because they come from your profit on a trade) then you are doing the same thing.. I didnt like the analogy above where you compared free coins to gambling at a casino because there really is no gamble.. There is guaranteed success because your investments are in the context of a solid method... Looking again at your casino example: If you took your profits from trading and went to the casino and everyday bet todays profits on roulette and accepted all the losses but also kept all the gains, your account would grow quickly also... Because sometimes you would win big, and those would be added to your trading account to create more "investment profits"... If you are only playing the casino with profits generated from your trades, then your account maintains its overal size, while you get to play the roulette table for free.. Thats not gambling, thats getting a free spin every day..