No.

You don't sell your bitcoin to invest into an ICO. If you want to invest into an ICO, use a part of your savings (not in btc) so that you keep both of them. Because if you really think that it's a good project.

You don't have to sacrifice your bitcoin for it. That's my opinion and that's what I'm going to do. I'll keep my bitcoin and will use cash to invest on any project/ICO. But isn't it that ICOs are almost forgotten these days?