Fuel Station on your left, W-beacon close by, Con Store just within scanner range. Maybe they've got some cheap bling? Well, not much of a detour, so you pop in for a look. But first, you check what the main station will pay for that hold full of furs & liquor you've got, just in case there's a better deal out here.
Well inside, you get rid of the liquor, but hang on to the furs, because they're worth more closer to the planet. But then you notice there's a bunch of, er, migrant workers and, uh, pharmaceuticals in stock. But your hold is still half full of furs, and you can't fit everything. Where's the best profit margin? Having failed to check (and write down/remember) all the station prices, the only way to find out is to launch, check, (remember, this time!) and redock.
Now, if you only you had some sort of gizmo that would allow you to target the Con Store (or any other dockable object) and access both price lists simultaneously, say from the F8 menu...
For those miserly guys like me, flying around in an underequipped CM3 trying to maximize profit while saving up for something nice, this would be a nice time-saver.
Now before someone says "Mediocre idea! Why don't you do that yourself?", please be aware that I couldn't code my way out of a wet paper bag.

As an afterthought:
I have no clue where the price list is stored, but if it's a similar property as the bounty for ships, a rewrite of the Bounty Scanner could possibly (sort of) get the job done. The downside to this would of course be that you would have to switch back and forth between the view screen and the price screen while comparing. And it would really clutter up your view screen if you were ever to target a station for, ehrm, other purposes.