It depends on the coin. A low value coin with no real purpose and no volume on exchanges will be low value or even eventually worthless. If you keep to top ten in coinmarketcap you should do well.
Top coins can always be outdone, just like myspace and can be replaced by facebook.
Today's new coin can be tomorrow's standard. Again, it comes down to risk appetite.
Otherwise nodobdy would do ICOs.
I may happily invest in a cheap coin, knowing it could easily double in price...