Reasonable reasons why someone or I personally would not invest in Altcoin? because most of them are worthless altcoins, but I'm not saying the highest altcoins or those already on the coinmarcetcap list.
my advice invests in a good coin so that your investment funds remain safe and can provide maximum results. You can invest in BTC, ETH we all know BTC is king so choose the obvious and be able to compete in the market.