Man, you were really determined to make acai work with Myspace eh? I mean you tested 14K clicks and still couldn't make it work? It doesn't really sound like you were tweaking enough between clicks. Send 100, check ROI, tweak, send another 100, rinse repeat. Sounds like you sent 1000, then maybe made some changes, sent another 1000 etc especially when you are saying you had such a shitty CTR. An acceptable CTR obviously depends on what niche you are promoting, but for acai personally I would want a minimum 25% CTR.
On another note, why didn't you quit earlier instead of burning through that much cash?