I've just discovered PETA while browsing Havelock and am interested in learning more and possibly investing.
I did a bit of math, to see how long it would take to pay back my investment by earning dividends:
PETA Last dividend: 0.00063172 BTC/unit/week
PETA Last price: 0.07200201 BTC/unit
Weeks to recoup unit cost: 0.07200201 / 0.00063172 =~ 114 weeks = 2.2 years
Even if the dividends were to double, we are still looking at over a year. Is this calculation meaningful? Is 1 - 2 years to recoup this investment considered good, bad, or so-so? What am I not factoring in or taking into consideration? ...

Not taking into consideration, that you own the shares, too.
You can 'mine' for some time, then sell the shares.
This is the most important part.
Owning shares in Peta is akin to owning ghs on the exchanges that sell them, except Peta will reinvest on your behalf and you can still cash out at your leisure.
If you bought 1 share and then sold after dividends were paid you cashed out with a positive roi, regardless of what's going on behind the scenes.