Usually they are repeat customers, coming back with issues stemming from the boot itself, not the footbed. Almost everyone who goes into the shop leaves with a pair of Instaprints - anyone who gives a shit enough to go through the sole planing process DEFINITELY does since it's a costly venture.
I mean, I'd be tempted to straight up refuse to really fit someone if they were going to refuse to get at least a pair of trim to fits or Zaps or something. I couldn't guarantee their boots will fit them correctly otherwise
It's akin to someone refusing to buy high quality tires for a racecar and then expecting me to make the engine faster or something.
Boot planing almost only happens on race boots (or at least really high end alpine stuff) we're working on, but we get customers that drive 6-7 hours just to the shop to get their stuff fitted, so they're good for it.
(I had a guy who drove all the way down from Bend, OR, because we do more shell modification rather than liner modification - the Masterfit colleague at Bachelor is more of the opposite philosophy)