Offering too high bonuses either locked up or not will still cause some form of uncertainty for investors and prompt weak hands to dump.
That might happen nevertheless if the product is solid and investors have their full trust to it then dumping will lessen.
50% for me is still reasonable especially for early investors but 70% to 100% is too much as it's more likely a give away.
Having too high bonuses isn't a strong basis to call an ico as a scam because it does have many aspects to look at.
solid product and investors with full trust aren't a guarantee that ICO will not dump on its first exchange. instead big holders will try to buy at lower price by dumping their big bonus and trigger panic sell.
big bonus is not a sign of scam ICO but a sign that the token will become whales toy
Wait, I didn't say that investors and solid product will guarantee that the token will not get dump but it will further lessen the chances of getting dump.
I see some icos that pointing fingers to bounty participants saying that they're the reason why the price fall but the truth is investors are the first who dumped their investment because they lose their trust to the product as well as the team. And it's vital if investor's trust are already ruined.