Giving 15% to grow the community is good, very good indeed!
Dilution with 15% all current PTS holder is not good BUT PTS holders must be aware of this already, so it is OK!
But the arrogance it takes for Invictus to treat those 15% of PTS as theirs, as something that belongs to them...
I can somewhat see why you would like PTS to just stop before the originally planned 2million is reached, however...
Stan is not treating them as his own for his personal profit (huge difference). Stan and bytemaster had to invest their own money to buy personal PTS & AGS to personally profit from the bitshares project.
Yes, certain decision making for the community is somewhat centralized at the moment. I think most people invest because they trust Invictus to make good decisions on behalf of the community, and understand that they may not agree with everything.
A lot of communities really suffer because they don't have any communal funds that are spent for everyone's benefit... They are left to beg for donations from the community, and those that don't donate kinda get a free ride from the work and donations of others.
Also, my recommendation if you are worried about 15% is to head over to:
http://www1.agsexplorer.com/Make the commitment, stop sitting on the fence!

I don't mean to make light of your concern but try to think of the biggest picture.