I have never invested in to any of such and neither have i seen any coin whose price dropped to zero. The only thing that i think can happen to any worse coin or better stile a shit coin is for it to be delisted from an exchange. Although have invested into a coin with that went down to the worse price i have ever seen. It was a real scam coin. The developer wanted to quickly sold what was with him and wanted to efface, but the exchange was able to detect it, his account was blocked and he could not withdraw his BTC.

Although some altcoins might be plummeting in price, but that does not mark the end for many of those altcoins. Very soon i see the rise bin price of some of them. The plummeting of the prices is the result of the activities if traders. So, if you see the altcoins you are holding, reducing in price, the best thing you can do is hold until it appreciates.

Proper research definitely needs to be done on whatever coin you wish to buy. So that you won't end up buying a shit coin. Although there are coins good to short term investments, while some are good for long term investment.

More people are beginning to see the opportunities embedded in bounty campaigns. I think they should not be deprived from earning also. Rather those who have been there should try as much as possible to move to higher ranks and try other possible means of earning, apart from the use of social media for bounty.