I think to do what your saying you'll have to be able to buy a significant amount at a time to get the direct from factory price, other wise your looking at just buying wholesale. I thought about doing it until I realized I would need about $100,000.00USD to get started. My idea was to buy a crap load of cpu's direct from Intel, then sell them at a 15 to 20 percent mark up on e-bay.
That is how many start out with. no one can make 500,000 USD strictly in years of employment!