There is different type of altcoins even if we can indeed speak about casino.
However, we can look at some parameters:
- How old is the coin?
- Was it attach overtime and how did it evolved to prevent such attack again?
- Does it have an active development community?
- Does it play the marketing part at 100% in order to attract people or is it reinforcing it's technology foundation to make sure it will stay overtime?
Bitcoin is a reference. 50% in the portfolio is great. Then you can probably put 5% here and there. I would keep 10-20% for highly undervalued coins such as Feathercoin for instance.
I agree with you man, 50% in Bitcoins is great for every portfolio. We can't deny the existence of some altcoins, and their potentially great future. I have around 10-20% in some undervalued coins, with the price under 10c and market cap lower than 10 million. Who knows what the future holds, the crypto market is changing all the time, making progress, upgrade, I wouldn't be surprised if we see some changes in the top 10 in the next few years!