that was an interesting read. i am surprised the faa came to that decision w/ regards to the Pelouse Soaring Society.
And in regards to that decision and glider towing, I'm copying and pasting from another poster, another board.
<snip>your interpretation is from 1990 and 61.113 was updated in 2004 to allow a private pilot tow gliders for compensation or hire.
Quote:
Sec. 61.113
Private pilot privileges and limitations: Pilot in command.
(a)
Except as provided in paragraphs (b) through (g) of this section, no person who holds a private pilot certificate may act as pilot in command of an aircraft that is carrying passengers or property for compensation or hire; nor may that person, for compensation or hire, act as pilot in command of an aircraft.
(b) A private pilot may, for compensation or hire, act as pilot in command of an aircraft in connection with any business or employment if:
(1) The flight is only incidental to that business or employment; and
(2) The aircraft does not carry passengers or property for compensation or hire.
(c) A private pilot may not pay less than the pro rata share of the operating expenses of a flight with passengers, provided the expenses involve only fuel, oil, airport expenditures, or rental fees.
(d) A private pilot may act as pilot in command of an aircraft used in a passenger-carrying airlift sponsored by a charitable organization described in paragraph (d)(7) of this section, and for which the passengers make a donation to the organization, when the following requirements are met:
(1) The sponsor of the airlift notifies the FAA Flight Standards District Office with jurisdiction over the area concerned at least 7 days before the event and furnishes--
(i) A signed letter from the sponsor that shows the name of the sponsor, the purpose of the charitable event, the date and time of the event, and the location of the event; and
(ii) A photocopy of each pilot in command's pilot certificate, medical certificate, and logbook entries that show the pilot is current in accordance with Secs. 61.56 and 61.57 of this part and has logged at least 200 hours of flight time.
(2) The flight is conducted from a public airport that is adequate for the aircraft to be used, or from another airport that has been approved by the FAA for the operation.
(3) No aerobatic or formation flights are conducted.
(4) Each aircraft used for the charitable event holds a standard airworthiness certificate.
(5) Each aircraft used for the charitable event is airworthy and complies with the applicable requirements of subpart E of part 91 of this chapter.
(6) Each flight for the charitable event is made during day VFR conditions.
(7) The charitable organization is an organization identified as such by the U.S. Department of Treasury.
(e) A private pilot may be reimbursed for aircraft operating expenses that are directly related to search and location operations, provided the expenses involve only fuel, oil, airport expenditures, or rental fees, and the operation is sanctioned and under the direction and control of:
(1) A local, State, or Federal agency; or
(2) An organization that conducts search and location operations.
(f) A private pilot who is an aircraft salesman and who has at least 200 hours of logged flight time may demonstrate an aircraft in flight to a prospective buyer.
[(g) A private pilot who meets the requirements of Sec. 61.69 may act as pilot in command of an aircraft towing a glider or unpowered ultralight vehicle.]
but an important one??? 
