If you take this dividend and multiply it by 52 ( weeks in year) and 3 ( years, AM share value was most of the time calculated at ~30% yearly ROI ) you get ~0.55 BTC what is close to the trading price at the moment.

But if you take into cosideration that you are getting now only 50% of possible dividends ( collecting investment funds by friedcat ) the real share price should be ~1.1 BTC so those shares at exchanges are heavily devalued right now.