I agree. We should not be permitting users to fill out the ask question form if we already know that the submission will be rejected.
When they press the ask question button or go to the ask question page (and honestly, they probably have that page bookmarked to be asking 2-3 times a day) then we should:
- display a message stating that they have reached their limit
- indicate how long they should wait before trying again (if they just hit their limit it should be under 24 hours)
- provide a link to the relevant FAQ questions here on meta so they don't feel the need to ask Yet Another Duplicate (TM)
- disable the text entry boxes and submit button
I can see the point of not expending the effort - honestly most of the people that this is affecting put no real thought into their questions, and so it's at most a loss of 5 minutes of work. However there are a few users who are otherwise reasonable stack overflow users, and we shouldn't be stubbing their toes with bad user interface design simply because they are hitting a limit that we consider abusive.