i guess alt-coins are what made for growing btc. you just have to invest in solid projects/coins & then wait for a week or weeks & you'll be in atleast 100% profit.
It's a good way because it improves the crypto industry and people can have a variety of choices on what currency they will be using.
There is a healthy competition but I tell you, they can co exist and make a progressive industry, let's have some altcoins for our investment as well
just to get ready for the future as I am pretty sure they will grow.