Now then: let's talk about cars from Denver.
I don't mind renting a car. But I'm not going back to Denver. It's about $140 to rent a car from Denver for the round-trip (actually, Travelocity shows the cheapest compact is $128.61 from Payless, picking up on Thursday, 5/31, and returning on Monday, 6/4).
The one-way charge, however, is more than $340 (compact from Alamo, picking up 5/31 in Denver and returning Tuesday, 6/5, in Albuquerque). I'm already planning to rent a car for the Santa Fe trip, for about $60. But that's still a huge difference.
I am willing to kick in $100, cash money, for the cost of a car rental, if somebody else who's going round-trip from Denver will rent the darn thing.