I'm also on the Front Range (down in C Springs). Started with 2 gliders 9 years ago, went up to 4 for a brief period then down to 1 and now back to 2. I have a huge cage that could house more gliders but I draw the line at paying someone to rescue their glider.
I could see paying for toys, pouches, maybe even quality spare cages but it seems most of the ads I see wanting "rehoming fees" are just trying to recoup the money they shouldn't have spent in the first place rather than trying to find a good home for the glider(s).
Let me know if you run into any others who are more interested in their gliders' welfare. In the meantime, I think there are 2 different steps to becoming a rescue. One (not necessarily the first) would be to make sure you set up in accordance with whatever the animal welfare laws are in your city and county (e.g., in C Springs, I couldn't take in more than 10 quail without violating city regulations).
The other (and probably more difficult) is to gain acceptance with the online glider community. They'll want to see a track record of knowledge of glider care before calling you a rescue and recommending you as a destination for others gliders.