Costs of certification of the Rotorway would be prohibitive - even if Rotorway had a history of certifying helicopters (nothing against their technical merit, but the pitfalls of certifying are many and expensive).
Look at the recent spate of failures of Very Light Jet manufacturers - all of whom were new to getting a fixed wing aircraft certified (a much less complex task than certifying a helicopter). All failed due to lack of understanding of how certify, and in at least one case actively went against the FAA's advice on how to get certified.
Rotorway would have a huge issue getting certified and would never recoup the cost.