GLBSE's Shares Issued is more like Shares Issuable. If dividends have been paid, maybe you can use the Shares Paid as the share count instead?
Not sure if that would be a good idea. Average trade price should reflect this fact, no matter who holds those shares.
You misunderstand. Shares issued is inaccurate. It is shares authorized and authorized but uninsued shares have no value.
An example.
I form a company (real world). State of VA asks me how many authorized shares. I say 1 million.
Now my company is worth about $100K and privately held between a few investors. No need to get fancy. I issue 1000 shares at a par price of $100 ea. $100K company, $100K in issued stock.
By your method my company would be worth $100M. Had I arbitrarily told state of VA I have 1 billion authorized shares you would be valuing my company at $100B.
Authorized shares have no value. Issued shares do. Issued shares are what are traded.