Ian is on the nail here. I would think 95% (or more) of Tyros owners are ex home organists who are not very good players, but what they do have is enthusiasm, money and a love of the organ and keyboard world. In the UK the Tyros outsells every other arranger by at least a ratio of 20:1. Its because Ketron are viewed as a professional keyboard, the Korg is a kind of crossover and the Tyros is 'their' keyboard. It exists simply because the Home Organists had nowhere else to go after Yamaha and Technics disapeared. Roland lost the edge because they did not understand the most lucrative market: the retired home organist and Hammond were plagued by EU regulations and threw in the towel.
The Tyros was a stroke of genius by Yamaha and I am absolutely convinced this keyboard primarily exists for the very strong UK market (you chaps benefit from it) It might seem odd to someone who does not live in the UK, but I would bet money that Yamaha sells more keyboards in England, NI, Wales and parts of Scotland than they do the rest of the planet put together.
If there is a Tyros 5 (which I believe there will be) its viewed by people here as an 'upgrade' and released by Yamaha at the perfect moment when their owners are getting a little bored and looking at jumping ship. Its already happened this way three times.
Its a hard fact that the word Tyros is Latin for 'Novice Or Beginner'...and no doubt how the Japanese see the Tyros Market. Just compare the average ability of a Stagea player in Japan to the average ability of a Tyros owner and the penny drops with a loud and very uncomfortable clang.