As far as scaling, here are my 2 cents. These apply to workshops overall. I'll let you determine if they're applicable to hardware:
1) Create informational products.
These would be ebooks, DVDs, CDs, premium podcasts, etc. These products are easier to scale than the instructor and physical space constraints of in person workshops. For example, a yoga DVD can sell millions of units but a yoga class only 10s of students. If you can get people to pay for an in person workshop, you probably can sell DVDs to a larger audience. Of course marketing and customer acquisition would follow different paths from in person.
There is a lot of material online on marketing, selling, pricing, etc of informational products. While most of the actual products are crap, their marketing techniques are often valid and, if toned down, applicable to less snake oily products.
Ironically, there are a lot of informational products about informational products. Which kills me. I can totally see some guy who decides that informational products are a great business model but needs a product. And of course his chosen product is about how great informational products are. Nice...
2) Some people scale workshops by effectively franchising it to different cities. Not always easy but thought I'd mention.