i write retro (I am 60 now) games myself, large ones, the market in this really needs work. some of the work is easy to put in, like "market price" should reflect the lowest offered price or allow for setting too high or too low, in fact it is more code to declare too low or high.
to sell here uses clicks to seach the market to get prices offered, if no offers then at least one click to get the price expected to offer based on the prefilled (and too high) market price to get the sentence of our offer is not accepted as it is too low or high, try lower than x amount. this makes both personal time and valuable clicks used at a higher rate. and yes clicks are consumed. to me that is a lot more than taxes :)
searching by item type: misc, body, hand etc. is not really much coding either, radio buttons and a bubble search to load the dropdown menu, take at max a few days to perfect (programming slowly)