This post to clueless, to compare MetroPCS's small coverage area, and their LTE deployment which only exists in may 10 cities last time I checked and that delivers 3G speeds because they don't have the spectrum to build a fast 4G network (Guess who bought it all) to AT&T and Verizon is insane.
They're not in the market to build a fast network that matches VZ and Cellco. they're in the market to capture those people that do NOT want to deal with them, yet want a value for their dollar. And most if not all of their network is LTE now. And Metro can easily obtain the LTE network they need and have already with wholesale agreements. Why build and buy when you can lease?