This is it exactly. The Amish strive for their own flavor of independence. What exactly that means varies widely by group, they definitely can't all be stuffed into the same box. Some use gasoline and kerosene lanterns in their homes, and that's technology too, a long way ahead of rush lights or a fire pit. Their council or whatever in charge of each sect decides exactly where the line gets drawn on what technology they're able to use, and individual exceptions are made as well. I read about one Amish farmer who got injured and was unable to use horses anymore, so he asked the council and they approved him to buy and use a tractor. A tractor gave him more independence, even though they can't breed another tractor and raise the fuel for it on their own land.
Don't equate religious conviction with a lack of business acumen. These people have looked around them and done without the shiny things and eschewed society's interpretation of success for their entire lives. Bet they're willing to sacrifice deeper and work harder to achieve business success than most in secular society. The $$$$ goes a lot farther when your religion requires you to get a used work truck instead of a brand new F250 King Ranch, and you're thrilled because a stripped used work truck is still a huge upgrade from a horse and cart.
They also have their burnouts and layabouts. That's also handled a lot differently than in secular society.
