Hi guys

I'm reading about Waves and what the possibilities are for doing an ICO (it's just research, not intended to do one!).
I saw that investors can extract invested money from the ICO if it's not ended yet. Why is this option available?
To me, it seems to be very insecure and it allows manipulation.

E.g. Another competing token sale project or big whale buys 80/90/99 percent of the tokens (e.g. capped token sale 10mil with first-come-first-served) and extracts all his money just before the end.
This puts them in the position to prevent others from investing.

Do I miss something? Maybe things like: high fees for extracting money that you have invested in a token sale?
It seems for me that it's easy to manipulate the token sale.

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