Currently on the coinmarketcap site only about 1590 projects compared to at times more than 1700 projects. They have left many projects without developers or scam projects. I personally invested in some of these projects and lost a lot of money like bitconect and centra. Do you trust the projects you are investing in and will keep them for a long time until they succeed or are they just looking for profit in the short term?
I only invest on altcoins that are already established and are on the top list of coinmarket cap. It is risky to invest in new projects since most ICOs failed and most are scam. Most investors will not take the risk because there are over thousands of projects being created.