But these mining organizations will pop up and offer better deals, because they will have new hardware and dont have old investors (as I mentioned in previous posts). If you can make example, where they won't have better deals (your shares won't be overpriced), it would be appreciated.
To use tripppn's example, your "value" changes over time...
In the example he gave that R1 buyer had $33 for 10GH/s, by the time R3 comes around, that R1 buyer still only ever paid $33, but now he's gotten 110GH/s hashing for him. And when R4 happens he's up even more...all for that single early one-time investment of $33. Even the people who buy in at R3 getting 110GH/s for $33, by the time R4 happens his investment that was already made is increased.
You buy in another group buy and after 3-4 months your investment is done. How much is that share worth as of month 5 or 6? Nothing.
This is admittedly something that has to be explained more clearly, BUT it's something that would provide a lot more long-term stability to investors, and a steady increase in hash rate meaning that your investment continues earning after the first piece of hardware is obsoleted.