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Case scenarios that typically take place (scams set aside):
a) Bounty tokens are sometimes locked for x days/months after ICO sale. By the time these tokens are unlocked, ICO token value often is way lower than at ICO sale, and therefore the tokens given to the bounty hunters have less value than that stated during the bounty campaign.
b) Bounty tokens are released after the ICO sale. It is quite usual to see a dump sell on second grade exchanges really quickly after ICO sale/bounty token release, rendering the tokens a fraction of the ICO sale value, thus the tokens again do not have the values stated in the USD equivalent allocation.
c) Bounty tokens do not reach the exchanges at all, rendering the bounty tokens nearly worthless.
Of course historically there are cases that have risen in value with a tail wind, but unfortunately 2018 proved rather the opposite. What I mean by this is that the USD equivalent allocated token amount should not be taken verbatim, since it is specifically valued at token sale value, which is achieved by the ICO itself, but that is not that easy to be achieved by discrete token sellers on the market after the sale.