Some bounty hunters dump because the token price is reasonable on the dumped price. The team should be more active after the ICO or IEO is finished. If the team become less productive after it, it could really affect the price without some development of the promised project even it was stated on its roadmap. The most we could really blame is the team and not their early bird bonuses, dumping holders, bear market, FUD, etc. It was on the team's fault on why their altcoin's price is up or down. So in conclusion, bounty hunters are just a small part on why the price is going low.