>>5364219If you break the contents of one set to the individual costs
Piconeemo body- 1700 yen
Regular clothes- 3500 yen
Boots- 1500 (yes those things cost this much)
Weapons- Around 2000 yen at events
That's already 8700 yen and isn't counting the unique heads (a 1/12 garage kit head can set you back 1000-3000 and requires assembly and painting) and battle clothes (not sold separately AFAIK but most clothes like that cost around 2000).
So yeah you're actually getting a pretty damn lot for around 9000 yen.
If you're talking about places charging more than that, well, they're limited runs due to being a niche product and thus you get scalpers.