Revenues received by a Club or Club Affiliate pursuant to a stadium lease or directly related stadium-use agreement with an unaffiliated third party, where the amount of such revenues is determined based upon activities that are unrelated to NFL football, in circumstances where the involved Club or Club Affiliate is not required to make a non-de minimis investment of capital or cash to receive such revenue (provided that the provisions of this Subsection (1)(a)(i)(7) shall not be retroactively applied to include in AR revenues generated from nonfootball business opportunities arising out of leases or other stadium use agreements entered into prior to January 1, 1993, the financial terms of which have not been amended since such date);