The only reason I don't do terrariums these days is because even a half acre property with surround sound shade, sun, veggie, and ornamental gardens, plus the outdoor miniature gardens, and container plants woops me plus working with others in theirs!
I think terrariums are genious for apartment dwellers and those who don't have such extensive outside work going on though. I also think I will probably get back into terrariums and keep with a miniature garden or two or maybe a succulent box someday. This would be the case should the day come I am older then now and the size of my gardens here have outgrown my abililities, and have to downsize and sell the beauty to an appropriate younger set of Garden of Eden lovers. That is the only type that would be interested in my home now, as the property is far beyond mow, blow, and edge.
...........and then some!