I don't understand the issue of relating leasing to prepaid maintenance. You can lease a car or buy it, and you can buy a prepaid maintenance program or not, the two are not tied to each other.

I paid cash for each of my vehicles, but I still had prepaid maintenance for four years on the new BMWs.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue