Users should not be changing the prices of buyable items at all.
If the price is set at 99,546 or whatever because some people are impatient... but the actual going rate is about 150k, I believe that changing it to UB is justified.
Remember the GCFYP event? Those books went from next to nothing to UB within a day. I think if we set the UB change to 95k+ it would be justified (even though that event probably wouldn't fit the criteria probably as there was not enough data to change it to 95k+ before it went UB)
OR IF YOU PREFER... we could have a little "report as UB" button and I would be happy to use some SSW and TP searching to price the item personally