I do not know what all this talk about buying a cheap cam that will only be run for a few months because the camshaft is so cheap it will only last that long. I guarantee that if the engine is broken in properly on it initial start up, that your cheap Summit camshaft will last a couple of 100,000 miles.
The main reason people have camshafts that only last a few months is because they screwed up something on the engine during its initial start up and break in period. Most people screw up their new engine by not putting the distributor in correctly, and they sit there cranking the engine with the starter motor over, and over, and over, and over, and over...popping and banging the engine, until the engine is completely scarred up from the pistons to the main bearings.
This is what happens when an inexperienced "shade tree" mechanic tries to put a new engine in their vehicle.