When we make a mistake, we reap the, err... rewards. Own up to it and deal with it... I know it sucks, but that's the only honest choice.
Now for a suggestion... how about you (the OP), instead of paying Apple's crazy-high price, look into parts from eBay or an third-party Mac shop? Assuming the screen is fine and the keyboard/trackpad is fine (should be after drying), you're looking at a new hard drive, optical drive, and logic board. Maybe a battery, too... if you search hard enough, I'm sure you could find a busted Macbook on eBay or something and use its logic board and other parts.
And yes, if you've taken it to Apple already, you're too late for your little scheme. Not that I would ever condone anything like that, anyway...
(And I personally wonder if you'll ever even read this...)