Unfortunately history is littered with these premium airlines. BA LCY Club World survives because it's part of IAG, same goes for OpenSkies. La Campagnie got off to a bad start and still struggles to fill a 757 in all biz and the jury is out on its longevity. I believe Qatar stopped their premium only A320 LHR service.
MaxJet, EOS and Silverjet couldn't fill 757 and 767s. People want to fly as cheap as they can and nothing more. If they want the pomp and ceremony they can upgrade to biz on one of many other flights operated on these routes every day. NYLON is all about frequency. One a day to DXB is unlikely to pull in good yields.
Still. People don't seem to have issues getting investment for doomed to fail airlines.