The price you offer is awfully low. What stops the bounty hunters offer their tokens for 1.5 or even 2 XCP on DEX, giving the investors or speculators the chance to buy cheaper than from your vending machine?
What I am trying to tell is: you should have delayed sending out the bounties. Now it's a little late so you could offer a bit fairer price, making the bounty hunters don't count much in the equation.
However, it's your business, your call DEX is not much of user-friendly, which may give you an edge