OP - if you were at Pintastic, I owned the WCS that was front and center when you walked in the Free Play room. It sold at the show for what I thought was a very fair price... and that price was far less than what you're considering for this WCS. Mine was Cliffy'd, LED'd, flipper rebuild, top side teardown shopped, and had very clear yellow on one side, slight fade on the other.
From your pictures, the PF is NOT mint. Mint = Mint. Flawless, spotless...etc. That PF has wear around the Assist and left-hand "light free kick" kickouts. I couldn't see TV Award, Striker, or the Goal, but given that 2 out of 2 kickouts I looked at have at least some wear, there may be other wear as well and BTW, we've already concluded this is NOT a mint PF. Very good, maybe. Mint, no. I would recommend a Cliffy Set as my PF had wear at all kickouts, and the WCS Carbon Fiber/SS Cliffy Set covered 100% of the wear and made it look fantastic. But this also adds cost.
I also think the cabinet looks very faded. As shown above, there should be crisp yellow outlines, not beige, not white. Also WTF is up with the mismatching legs?
I personally think LED's add a bit of value but they need to be done to your liking. If you think you're going to be changing some (i.e. all the field on the BG, or some of the purple on the PF) start adding that cost up.
Lastly, I'd be going through the rest of the game with a fine toothed comb. The dent on the rails is unfortunate, the soccer ball looks to be new, but it has a ring of dirt. I'd also check ramps as those are currently impossible to get aftermarket, and then make sure the goalie works, the soccer ball motor is quiet, and everything else is good.
Once you get there, I think you'll realize this isn't a $3K game and more like a $2200-$2500 game (will vary based on the things we can't see from the pics). Good luck with the hunt. Very fun game to have at home with one of the best wizard modes out there.