Impossible... That's something computers cannot do by themselves... This project is quite funny ^^! Yeah, it's funny, sorry ^^!
By the way, I'm the best cutter around here ;) I also do great background replacements of human models and all the hair is right there! Even the messed ones! Jeje... I would like to see what kind of subjects you need to be cutted out, depending on its complexity, the complexity of the price. Cutting out non organic subjects (geometrical) are quite easy and can be done in a while, organic subjects (like plants, people, clothes) are a bit harder and they requires another techniques than using the pen tool. For organic subjects, I would need them over white backgrounds, for non organic subjects, doesn't matter the background.
Send me a PM if interested in a very accurated per object list of prices (cheaprices High Quality, I assure :))