Because the hackers know that way they make more money. errr let me explain my self. First they get whites and hexs on west, ofcouse first they make freaking lots money with every hex or white they sell. late ofcouse the items drop to dollar even cents.
Now they can't import anymore bug items, because whites and hexs is already so freaking powerful.

So now, they smart with east, they increase the bug items power little by little. So everytime a new bug item come out. The price can ofcouse rise to the top. Like a small charm only add 15 vit and some mf. I am sure they can make like hex, but they didn't. First they make bug valor then they just add some stockets on it. The price went from 2 dollars to 40 dollars.

Hope I didn't confuse anyone with my theory... lol