I don't think your analogy holds. No prep company can afford to be as selective as an Ivy when hiring instructors. There's no element of prestige and no tenure to lure the best and the brightest. And, unlike professors, the shelf-life of an LSAT instructor tends to be very very short (people good at the LSAT are also good at getting into top schools, becoming lawyers, and making a lot more money than anyone teaching prep classes). Prep companies thus tend to find themselves desperate for a warm body to stick at the front of the classroom.
Really experienced instructors with, say, 5-10 years experience under their belts are few and far between regardless what company you're looking at. No matter how good Such-and-Such LSAT Prep, Inc. might be, you don't want to be in a class taught by a newbie.