Even tho Pershing owns about 9 percent of it, (Ackman), this does not mean all his clients are the super wealthy.
The Robin Hood defense has long since been defeated. You can not steal from someone "just because" you think they are rich. The majority of shareholders are average people like firemen, police, teachers some of which have fannie and freddie in their retirement and they dont even know, because they dont track it.
Even if you have accumulated a million dollar portfolio, that is just about $30,000 per year, if you are retired conservative investor fully invested in FDIC certificate of deposits. Many just dont want to risk the stock market, and the government stealing fannie and freddie shareholder pensions does nothing to deter than mindset.