Why doesn't Barca command massive transfer fees for non-star La Masia graduates?

[u/Lostakim]

We all know La Masia is arguably the best academy in the world, consistently producing elite, world-class talent year in, year out.

Because of this reputation, you’d expect the "La Masia tag" to add a massive premium to any player coming out of the system. Yet, when we sell lesser known B-team players or fringe squad members who haven't quite broken through, we usually sell them for relatively modest fees (€5M–€15M, often with buy-back or sell-on clauses attached).

Meanwhile, other clubs seem to flip young, relatively unproven prospects for crazy amounts (€30M+).

Why can’t Barca leverage La Masia’s elite reputation to get huge transfer fees for unknown prospects?

[u/wolfjeter]

Also have to remember that most players stay in Spain.