I have had at least one Hoya carnosa at all times, for the last seven years. My best guess is that I was averaging about three or four at any moment; the current count is five. In all twenty-five(-ish) of those accumulated Hoya-carnosa-years, not once has any of them ever attempted to bloom. H. lacunosa, sure, all the time. H. bella, quite a bit lately. But never H. carnosa.
Which, we'll see if it's sincere about this; you know what happened with the Phalaenopsis.1