Why ? Its too risky..always diversify your investment. Dont put your egg in one basket.
It depends. IF OP want to buy bitcoin, ether, monero ETC then he should go all in. If he want to try different approach then he should spread funds in lots cheap low cap altcoins which are few cents up to maximal value of half dollar.
That's a terrible advice!
Investing is risky, period!
Investing in crypto is very risky, period!
Investing in a single crypto coin is just silly, period!
So what are you doing here?
I'm taking risks! But definitively not betting everything in a single asset...