maybe they don't want the job.
maybe they have too many infractions otherwise to be on the test server.
maybe we have hired people from the fanbase in the past and it has gone horribly wrong.
I don't look at my answer as an excuse at all. It is what it is. It is the nature of gaming. Our audience --gamers-- enjoy finding things that break. This has been true on every game I've worked on. Don't take it as a DDO exclusive.