Agreed. Companies have gone bankrupt waiting for certification, or even trying to get existing experimental models certified. For example the Seawind 300C, derived from the experimental 300, had undergone certification testing/development for 13 years before the company gave up and folded. Hill can very easily go bankrupt if they have no income at all and selling experimental versions is a great way to provide people with a ridiculously well-priced helicopter, as well as the enormous
PR boost from actually getting them to customers, while getting enough money to survive (or to attract more investment).
I hope this is not all BS. So far though it's just CGI and promises.
Bell: this is not a homebuilt. It's classified as experimental but is not actually offered as a kit; it's built in the factory. But as for your question, kits only appear cheap because they typically exclude the engine, avionics, etc. You're really getting a fully built helicopter for allegedly ~$600k plus two weeks of your time.