I buy because simple strategy, low price, stable volume and sometimes has big moving ( speculation ). No one of us know how the coin become? popular or scam, even tomorrow we don't know their price. We can only analyze with training & experience, nothing else. Every coin has different development strategy but their goal is same, make that coin become popular and number one payment. Just follow them and never lose faith they will grow up. But If you have doubt about ETC and LTC just leave it. Good luck.