I believe that 90% of all altcoins are a scam. You have to do your research and find out wht their unique selling point is. If they don't have one or it's not really solving any issues, don't buy it. Having said that, there are altcoins that do have real value. Finding those and then compare their potential value with their current market cap is key in good investing
RE: Bitcoin Maximalism - Are All Altcoins Scams?