I never want to invest on any of altcoins by selling my bitcoins because I knows that bitcoin has more potential than any other coins so it will give more benefits in future if we hold until,if you invest on altcoins you can invest the amount from profits of your bitcoin.
That's absolutely right bitcoins gives more benefits but i didn't say that all the time but for me if you want some long term investments i would probably take a risk on selling my altcoins to invest my profit to bitcoin.