The number of charter schools operated by education management organizations (EMO) and by charter management organizations (CMO) is more like 30%. They are about evenly divided between EMOs (for profit) and CMOs (non-profit). The largest growth rate in charter schools is with EMOs. Their growth rate this past year was approximately 70%. Ninety percent of all privately managed public schools are charters. The fees to EMOs last year averaged 23% of the cost per pupil. For CMOs it averaged 10%. These kind of schools are heavily clustered in Texas, California, Arizona and Ohio.
When the term "non-profit" is applied to a CMO that doesn't mean it is a charitable operations. Many are operated for profit by hedge funds. Please check this link.
http://www.chartergrowthfund.or/what.invest.html Your statement about some of the most creative schools in American being charters is, of course, an opinion to which you are entitled. In fact, the most recent data using standardized testing (the Holy Grail of accountability for the charter school movement) clearly indicates that most of these schools do not perform as well as their non-charter public schools peers. Have a nice day. :)