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.
Again, another group buy offers
absolutely same rules and reinvestment details as your group buy. These shares
worth same as your group buy shares. But they offer 150 GHs for 30$ at start (for comparison to your 110 GHs 30$).
Then, their R2 shares will rise to 200 GHs, while your R4 shares will rise to 155 GHs.
Then, their R3 shares will rise to 300 GHs, while your R5 shares will rise to 250 GHs. Another company pop up with 30$ for 350 GHs shares.
It's just the example, but you should get the point. These problems you could meet in future and come to the point where you couldn't open new rounds.
Basically your argument of why this won't work is because someone else could offer the exact same thing, but make it a better deal somehow?
Isn't that true of ANY group buy anywhere, where someone else could sell the same hardware cheaper?