Well at this rate, in order to make the same amount as previously, you would need to make a 1.8 second delay. However, as you said, this would complicate things for users, even those with a great CPU.

If you are willing to remove the captchas that need to be solved, then I guess pushing the delay down to 6 seconds would be fine. Even though it's still only 600 satoshis/hour, the fact that it's completely automated would make up for it I think.

Up to you, I'm still gonna keep using it either way