Thailand.
Basic daily wage of 300 baht (~US$9) is often quoted and paid here, though if they do decent work and you want them to hang around, better to pay around 400 baht (~US$12) or more.
However, all these comparisons with hourly rates in traditional labour markets are of limited usefulness, unless you are choosing between making dioramas and going to a paying job. If you are producing these things in your spare time anyway, and selling for more than the inputs costs, in a way it is money for nothing.
At the moment you are making the artworks then storing them away... which kinda means you are working for no reward whatsoever beyond the "joy" you get inherently in what you are doing. So, if you can sell some, then you are definitely better off.
I also imagine that, after producing 100 Peanut Star-Wars dioramas your marginal "joy", from producing another one, will be wearing pretty thin. It will interfere with the rest of your worklife and leisure time more, effectively increasing your labour input costs.
On the other hand, you might find ways to reduce your input costs (cheaper materials), improve your skills and/or manufacturing time (more efficient production techniques).
What this boils down to is that it would probably be fun and worthwhile to make a few for sale, when you have the time. Probably not worth setting up a factory, unless you want a career change
Another big plus from selling them is some cashflow into your hobby account, which you can use to get some better tools or to diversify what you produce, or whatever. Some people like this because then they don't have to justify hobby spending to their spouses!
Sorry for long post already. I'm an economist and we love to waffle on about this stuff.