You felt like you wasted your time because I thought the way you responded was kind of on the attitudeish side?? O-k, well if that's how you feel, can't change that, hope you have an awesome day though!
Will he still be top motivated, if you cut the 60% that you've promised? I mean, it he can make a great difference, it's potentially a lot of money that you with this approach would declare as unreachable for him, no matter how well he'll do.
Yes. Even if he managed to write the best script ever written you'd have pissed away your $3k and you would have ruined ALL chance you had of gaining any finance for your film. Even if you had your writer on a lower tier on your recoupment schedule, you'd still be screwed.
He's not being rude about it. If you want to see rude, put this deal inside a business proposal and take it to a shrewd investor. You'll see what rude looks like.