I think R* would appreciate that group leaders/moderators/etc have no influence over what the group actually does, which is why I don't see them being bothered about what goes on here.
As Causton has said many times, one of the primary interests of the group would be to lead research on the BAWSAQ market's mechanics and how interaction with the GTA Online environment can impact it.
Yes planned group buys and sales of shares are "exploiting" information, but none of it is really against the ethics of the game is it?
Even if the groups only long term purpose serves purely to spearhead such research, finding out what companies are linked and just how in game actions can change stock prices, then I think it will be seen as a positive by all.
What people do with the information isn't up to any group, that's down to the individual.