Can't say I personally believe that claim, but there are a fair number of people out there who do. One person even sent formal test results showing that the adapter drastically reduces EMFs coming off the case. Not sure what to make of it but I found it interesting.
Glad they are selling for you. It's a known issue, so I just went to the Apple store and since my MacBook was brand new, they gave me a three-prong adapter for free.
Can you share more info about the creation? Did you register a patent? What was the MOQ? Have you sold out? Did you have to comply to any electrical regulation?
Wonderful idea! I never considered that a grounded power adapter could solve the buzzing issue. But now that I think about it, that's the reason why I don't get the buzz when my MacBook is connected to my monitor.
Note grounding your MacBook is likely to result in you constantly zapping your MacBook with static electricity if you wear rubber sole shoes, which is likely to not be good for the MacBook and may randomly damage the electronics. This may be why they did not put a grounding pin the first place.
I usually discharge my static buildup in the office sink.
Exactly. The Apple extension cord is grounded. They likely didn't include a grounding pin on the stock adapter because (1) it'd be really hard to make it fold down and (2) you lose the option of which direction to plug it in (potentially blocking a plug). So it's a design call.
Apple supports grounding as a first-party offering by using their extension cables that plug between the wall and the power brick. So this product isn’t doing something untested and unsupported.
I had wondered about this, because my 2013 MBP was grounded (it came with this cable) and it used to zap me constantly. But I did not put 2+2 together.
They've been selling consistently to others annoyed by the problem or who want to ground their MacBook for other reasons.