Probably too conservative on the plat required to level. My experience, which matches Shades, is that it took me 10mil plat to hit mid 40s and 15mil plat to hit lower 50s by deconstructing L4 and L5 items I bought from the AH on the cheap (yes I prudently shopped). To hit 75 will be a heck of a lot more plat as the XP curve is exponential and not linear (which is why 10mil plat got me to the mid 40s while 15 mil plat only got me to the lower 50s).