Yes, it is resonable that you change item prices according to what you see fit, i have bean through 2 whole market overhauls while marketing and i i understand why.

But It is that sometimes its just to random on single items.
Also, try pricing items from the start. There are items that have no price and suddently they are like 5k. Some items were priced good (jyiu drrads were 60k- popular item everyone was buying at that price - for eample) and lowered now just like that.
Maybe u see problems where there are no problems.

What i was trying to say is to be more consistent. Maybe there is no actual need to change prices for old items. Maybe you could do that with more items on daily sale from time to time. That lowers the market value of the item wo tweaking the shop value and everybody is happy. People hunt for deals on items they want and other people dont get frustrated. Instead it just seems that there is a monkey slamming a keyboard.
A system with better daily/weekly discounts would fit better imo, and leave item pricing alone. Just my two cents.

Haha, i just read my initial post and it is bassicaly the same lol ) just with more hate