In my priority, if there is two projects, one have the escrow and one doesn't have it then, of course, I would go for the one have it in a heartbeat. I wish escrow would be a mandatory for every bounty campaign in bitcointalk.
But it cost money to hire an escrow to hold funds, i don't know how much though but it differs per escrow, that's just additional fee for the developers on top of the payment for hunters.
that's the thing to think about for every developer who wants to use escrow. at the very least, they can increase trust in bounty hunters by the way they hire escrow. Another example is, enough people pay attention to the current bounty detective or Murat. however, escrow adds value to a project.