Thank you, very informational post.
As mentioned above, the price will vary depending on the care you give your gliders.
I would like to add something in regards to breeding. Gliders are going down in price given how breeders keep lowering the prices in order to be able to house their joeys. I'll give you an example: I have caramel gliders, when I bought my first pair (as pet only) in 2013 they were $450 each (and that was considered reasonable), I am getting another pair this year(again as pet only) and their price has gone down to $350 each; older gliders are as low as $200-$250 each. Having said so, you can see how you will not be making so much by becoming a breeder.
Even with rare colors you may not be making back much more money. A few years ago creminos were sold for $2500 minimum, now you can buy a cremino in the low $1000s, and older gliders for even less.
Then, on top of that, breeders have to deal with people that will sell a classic gray for as low as $75. The people that offer prices like these keep their gliders in deplorable conditions without lineages of any type, and that is why they are able to offer "such deals"; but for breeders that care and give a proper environment to their gliders, competing against that is impossible, and you just end bankrupted.
I am not saying this to criticize anyone, just to raise a point that should be considered when trying to get into breeding.
The other thing people overlook is vet care. While gliders don't need vaccines, and if kept in a good conditions, they usually stay healthy. A glider can only be seen by an exotic veterinarian, which racks up the price a lot if they get sick with whatever.
For those trying to get a glider as a pet only, the lowering in prices may be a good thing. But the expense of the items to keep a healthy glider doesn't change, it actually goes up with time. As an example again, I'll use myself, though I am one of those that may give more than the bare minimum. In 2013:
1 Large Sturdy cage = $190
2 Cage sets and toys = $250
2 Wheels = $80
2 Bonding pouches = $50
1 Initial check-up = $150
TOTAL = $720
That is without the shipping and the food, and with some discounts.
Now, I have to go through a similar process for my new gliders and the prices are:
1 Large Sturdy cage = $225
2 Cage sets and toys (not as much) = $250
2 Wheels = $100
2 Bonding Colony pouches = $75
1 Initial check-up = $175
TOTAL = $825
That's around %15 increase in price in just 2 years. It may not seem like much, but it can hurt your pocket. Meanwhile the gliders' price have changed by around %30 (or more like %28.5), which again, can be good news for pet owners and bad for breeders.
Sorry for the long post, but hopefully it offers some perspective.