Sadly it's not the 70/80s anymore, most people don't give a damn about building stuff when they wake up in the morning, you need special sfx or something really spectacular to attract people, especially kids, who will shot selfies and videos near the giant sized robot|working jet backpack|150Km/h electric skate| etc. to climb their online social ladder. If you're smart you can slip some cool device, development system, analog electronics kits etc. under the radar and get a few of them to learn something when they get back home, but you have to provide motivation; curiosity alone works only for a small subset among us. So, why not partnering with schools and institutes? Wouldn't be nice if they rent a lab to a school for technical lessons, then assign tasks to teams and have say every 3 months the winning project published on the magazine? That would create competition encouraging more users/schools to join while boosting sales.

The gist is: you don't sell many Van de Graaf Generators (the device, not the band:^) kits until you show what happens to the girl's hair when she touches the electrode.