If you're planning on storing a lot of food for a long time, it's worth it. I started off buying a bunch of stuff from the mormon pantry. Most of that is 20+ years stable, and its mostly carbs.
But if you have a bunch of pasta what do you eat with it?
6 pounds of grated cheese turns into 4.5 pounds of freeze dried in 24 hours. That would cost $90-100 to buy the Augason Farms equivalent. Buy the cheese at sams or costco, bulk mylar bags and o2 absorbers, electricity, and I doubt I have $25 in it.
Local grocer has pork butts for $1/pound right now. Those are super easy to salt and pepper, throw on the pellet grill for 6 hours, wrap and toss in the oven to finish. It is some work to shred it, remove as much fat as possible, but then I have enough cheap, tasty, meat to feed the freeze dryer for a couple of days.
Last week was chicken fajita thighs on sale for $1/pound. We wound up with probably 50 pounds of those to run.
We haven't had ours long enough to catch a sale on eggs, or the occasional WalMart deal on milk but when we do we will run a bunch of that. It will be a long time before we get to what we feel is "enough" for us to breathe a bit easier. When we do, we will be able to run stuff for friends for many months and make a nice profit doing it.
You could also recoup selling freeze dried skittles or gummies, ice cream sandwiches, yogurt drops , etc.
There's also the claim that freeze dried keeps 90% of the nutrients versus home canning destroying half.
You also have huge space and weight savings.
I haven't reconstituted anything yet, but I have tried everything we've done. Trying some of this stuff straight out of the machine is hilarious. Meat that feels like expanded foam insulation, but tastes exactly as it should. Cheese, turkey, chicken, corn, mixed veggies, skittles, it all tastes great.