Good points; but, consider that Staples still does a lot of photocopying, despite how ubiquitous cheap laser printers have become. I believe there will be a large market for 3d printing services. Professionals will want higher-resolution prints than the consumer-grade 3d printers can produce. They will also appreciate not having to train staff to use the machines. Many others will just want to experiment, without making a capital purchase. (Custom-printed Christmas presents anyone?)
Of course, if you’re really serious about exploring the new technology (as opposed to some specific applications), you’ll do what you’re doing & get your own equipment.