I'm not sure that the "wannabe lance" type of consumer that would tend to buy a Full Dura Ace BD road bike is necessarily the type of person who would buy a Full NJS BD track bike.
If 75s go for $160 retail and if that translates to about $80 wholesale, then perhaps it would be worth it. But above that, I think a mid-priced crankset would work just as well. And I mean MID-level like whatever would be the track equivalent of 105 or perhaps Ultegra level parts on a road bike. After all, the theme of this thread is "value conscious", right?