That is a simple way to trade but that is the most risky way to trade because it only depend on the developers as if they will work for their coins then the coin will increase in price while if the developers will not care and will not work to increase the demand of their coin then the trader of that type will lose. The best way is to invest in only legit cons and have to adopt the strategy of short term and long term investment and have to focus on fluctuations and to earn from these ups and downs in fluctuations.