I don't agree with this strategy. You need to do thorough research before investing in any altcoin. I would recommend investing in not more than three different altcoins. If you go for a higher number, then in all probability you will be investing in at least some of the shitcoins. Also, following a large number of coins can be cumbersome, especially if you are not a full-time cryptocurrency traders. And you need to follow them frequently, since altcoins are much more volatile when compared to BTC.