If you set the price to 50,000,000 naturally (hit 10 million x5) then you can reduce without crashing. If you click 100 mill and the game forces it to show 50 million, you can't reduce after that.
Most of this regarding the crashing and limiting other stuff to 50mil is almost certainly custom UI issues not EQ2 problems.
Ok, Standard-UI users are now able to put 50m in broker, trade window and mail (not longer only 9.999.999p). But this new limit 50m is also the max for DARQ-UI users. Darq-UI developers are not longer able to break this limit. I like that. Prices will fall in the long term.
Prices will not fall either in the long term or in the short term. They will sell at a personal meeting, that is, in an inconvenient way, but the prices themselves will not fall. Now the crown costs 1750KK PP min, it won't be cheaper