Just to underline the cost of TSO'ed ADS-B, probably a fairly accurate costing here -
Current Alaska (ADS-B) cost estimates range from $14,000 to $18,500 per aircraft for installation and the hardware.
Extract via -
http://www.alaskajournal.com/stories...80831035.shtml
As an aside, re how costs affect pilots - I was talking to somebody the other day who said they quit their AOPA (Oz) memberhip when membership costs near doubled. (plus its a rich mans club)