Do you have any warrantees that coin won't be dumped when it reaches exchanges?
Well if you expect that someone will give you that kind of warranty, then you are in a dreamworld. It is just speculation and probability based on the project, business model and market condition.
If they can warranty that I will sell my house to invest into this ICO. they will have some plan to protect price like send bounty reward after 1-2 month. but they cant warranty
Think you that if they wil hold bounty for 2-3 month it will be warranty? Bounty is not real problem of price dump after many ICO. Main problem, is than investors want to quivk flip and go to another one ICO, to find that one, which will give at leat 3x at first day of exchange