I'm unsure. It depends on the demographic of shooters in your area: what they shoot, how often they shoot, economic status, etc. Ammo prices and reloading materials (particularly, lead and brass) seem to keep going up, and if somebody shoots rifle, or larger caliber handguns, reloading is probably the way to go.
That initial cost, particularly if they're going for a good, progressive press, can be daunting. Not only do you have the cost of press and dies, but depending on what you're loading, you may have other equipment: case prep equipment, brass tumblers, scales, calipers, etc. Then you have your expendables, like powder, bullets, cases, and primers. You'd need a dedicated room or area for reloading, where you can be free from distractions, and a safe place to store the stuff that can go boom. Reloading manuals. Must have.
I'm by NO means trying to put anyone off of reloading...if I could afford it, I'd be doing it myself. You can buy kits for specific calibers, and once you've dialed in the correct settings, you can pretty much just chug away making rounds indefinitely, unless you start experimenting with loads. If you shoot competitively, and do it often, you would very soon make up the initial costs from not having to buy commercial ammo anymore. If you shoot something goofy, like .38 Super, you'll recoup your initial costs quickly. If you're a hunter or shoot some sort of centerfire rifle competition, you can reload ammo specifically for your rifle chamber, increasing the accuracy and consistency of your shooting.
Having said all that, to me, the only downside of reloading is the initial costs. Once the equipment has paid for itself, it's all gravy from then on.
Not quite sure how'd you'd be able to do a reloading class in a classroom-type setting. Bunch of single-stage presses? Turrets and progressives would get expensive quick.