Stock Market Max Price

So I noticed while selling on the stock market in game that I am unable to sell at prices above 60 Money/Unit (Selling small amounts of raw materials). I was wondering if there is a reason for this cap and if it will eventually be increased. I have already been selling at this price. It seems I will need to stop selling on the stock market because of the inability to increase price further. Right now my only option is to do an auction through the Newspaper and personal trades, although this eliminates the anonymity the stock market provides.

Thanks for any help or suggestions