growth rate for alts is more higher than for BTC. Sometime BTC growth on the 10% can lead to alts growth on the 50-60% without any fundamental reasons. Only strong market growth. That's why I hold some alts not BTC only
Altcoins are having both big advantages and big risk levels. But considering to avoid unnecessary risk, many people including myself not showing interest to invest in altcoins.
I believe that will not be a very big mistake of life time because bitcoin is performing well to get good returns for my capital. I am still holding regardless of what other people are suggesting here and there. I believe into bitcoin and its potential and moreover into its bright future hence I am happy with my holding.