I'd love to have a nice slab of spare parts, custom made for me in case of injury.
You'd have to fight back the idiots who would claim the bodies had souls. That's probably the biggest hurdle, the people who would violently try to stop you because of their sky daddy fantasy.
But even if you defeat them, you have the accountants. That spare body isn't going to grow and remain healthy without a lot of effort. It will need to be fed and cleaned and exercised. During growth it will need to be monitored and probably adjusted with chemical cocktails to ensure it turns out similarly to you - you did want all the bones to be the same size as yours so you can harvest those, right? As long as you're cloning an entire body, you'll want to correct any genetic defects you can - especially for those things that might lead to needing a clone body for spare parts. You don't want to get liver cancer only to find your clone has it too. That's all going to cost a lot of money.
In the end, the real solution is to be able to grow parts as they're needed, not grow an entire body requiring expensive maintenance that you might have to throw away after you harvest one critical part.