It's a fair question and it's been the cause of a few threads calling for some delegates to account for their pay, some to be voted out, and others to be voted in.
In one of the other threads on this topic I postulated that cold storage and collateral voting was the root cause. Apathy I'm sure plays a part too. It's just hard to get upset when the market cap is so low. A 100% delegate is making about $4.86/hr assuming a 2000 hour year.
Things will be different on the new chain; likely for the better. In the mean time there isn't much incentive to take the delegates to task.