I am always buying new altcoins, both old ones and new listed ones, i think they will boom sooner or later, the only thing im concerned is the government policies.
I bet you may loose lot of money buying ALL altcoins. Why don't you choose only the little number buy that will bring you great income?
You should always have a strategy like how many percent of your portfolio should be divided by bitcoins and altcoins. I try to keep %70 bitcoins and %30 alt coins in my portfolio. Even if one part goes bad, there can be chance for other part can go up.