There are a number of things to consider before breeding gerbils as a potential sole source of snake food.
I think their nutritional quality would be in between mice and rats, so I don't think that's an issue to worry about. And I have raised them as an addition to raising my own mice, and find my snakes have little problems going from gerbils to mice. They don't seem to care either way.
A few cons:
#1: Gerbils have small litters compared to that of domestic feeder rodents such as rats and mice. The max I've ever gotten has been 6.
#2: Gerbils do better in a 1:1 ratio, occasionally a 1:2 will work out. So that means to keep up, you have to have several cages of a 1:1 just to keep up with demand. Talk about a waste of space. A rat/mouse colony can be up to a 1:10 depending on the size of the container.
#3: They pretty much require glass aquariums. Yeah, they can be housed in a wire type cage, but they're such diggers that you'll end up vacuuming everyday because of the mess. And multiple glass aquariums are a pain and a half to maintain.
#4: Will require you to pre-kill before feeding as gerbils have a very strong anti-snake arsenal. They can seriously injure your snake if fed live.
#5: I found it damned hard to find a female gerbil with decent maternal skills, and I went through 6 and ended up with one who'd nurse them to fuzzy stage and then ignore them. It ended up so bad every time she would give birth I had to place the kits with a lactating rat to rear the babies. The babies were always kicked out of the nest box and lost somewhere in the bedding, cold and never fed.
Pros:
#1: Require less water bottle refills since they're from an arid climate. And they also urinate less.
#2: They have barely noticeable smell to them since they urinate so infrequently.
#3: They tend to be cuter and friendlier than domestic rats/mice. And tolerate handling much better.
#4: The kits are smaller than mouse pinks, and are perfect for the smallest of corn hatchlings. And their scent may encourage stubborn feeders to eat. Also, when gerbils reach their fuzzy stage, they're about the size of a large mouse pink. So you may be able to use that to your advantage to get your younger snakes on larger rodents which generally encourages the growth spurt.
It just depends on personal preference, really. =)