Why do you think good altcoins fail to keep going? It seems there are some that are good and people collectively have put in tens of thousands of hours supporting, but the team decides to give up midway.
Becouse no big community!
This is one reason on which it has less community compared to bitcoin thats why they commonly failed especially if the interest is absent on a particular coin just like what coin you promote as i saw on your signature showing LEOcoin its just a total trash and with less support from people and lots of negative feedbacks it will surely fail no questions asked.