It wouldn't surprise me at all if the cost structure does work out but the complete picture can't be disclosed for competitive reasons. There are a lot of "obvi

It wouldn't surprise me at all if the cost structure does work out but the complete picture can't be disclosed for competitive reasons. There are a lot of "obvious ideas" that have only come to fruition recently where the technology was already basically proven, but only entered productive use after several generations of systemic improvements made it a competitive choice. For example: LED lighting was around for several decades but only had niche application until gradual cost/quality improvements pushed it ahead of older lighting tech - and now every major city is rushing to replace all their old street lights. With the Gravitricity tech there are factors like the cost of drilling, the strength, cost and density of the materials used, and lifetime maintenance costs relative to other solutions. There's lots of room for expertise to know for sure what the issues and bottlenecks are. I'm looking through all the dismissive comments to see if any of them are pinpointing it as a scam - because this is, after all, the kind of idea that is simple enough to captivate laypeople and lift dollars out of their pockets. But judging from this kind of response, it seems like it's also the kind of idea that is simple enough to be dismissed as a "they would have done it already if it worked," rationalized via fuzzy back-of-the-envelope math. Ultimately, since I have no stake in this one, I'll just wish them luck.