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I deleted the post after seeing that others believed it’s not a good idea…

Sorry, but I've got to rain on your parade....well from my own perspective anyway. I live in Australia where aviation costs range from 'gulp' to 'eye watering'. My personal problems, well at least the ones people don't talk behind my back about are health related and not getting any younger. I've had diabetes since I was a kid, I got a class 2 medical once but it had so many conditions on it that made it not worth the trouble. By the way, any diabetics out there who have managed to make a living out of flying, I salute you. It's not easy. So LSA is my only option, it's hard to beat Sonex's bang for buck value. I have spent a lot of time with my hangar neighbour talking with and about his RV 10. It's a lovely aircraft, he has got every bell and whistle you can think of on it. He spent more on his engine than I did on my complete aircraft! I know if you removed at least 3 bells and a whistle from his aircraft he would be $100k better off but still be way over the Sonex cost. But you can't get away from needing the bigger motor and that much metal to get you and 3 friends off the ground. I personally can't see a large enough market for another aircraft in this category. I'm certainly interested to hear other peoples opinions. Good luck regardless.

Deleted the post after seeing it wasn’t a good suggestion

Why is it not offered by Zenith any more? Why would Sonex want the liability of someone else's design?

I deleted the post after seeing that the suggestion was not a good idea..

I see you really like the airplane and that is cool. None of your response really answers the questions though:

Why is it not offered by Zenith any more? Why would Sonex want the liability of someone else's design?

As a confirmed part of the Sonex target population, I would say that the airplane offers nothing that I want. Looks is a part of it, and I'm not keen on Zenith engineering. I do like my Waiex - looks, structure, static testing, efficiency, handling qualities.

Whilst I doubt Sonex would be interested in the 640, I believe there could be a market for a lower priced 4 place. You only have to look at the outrageous second hand prices of the Sling TSi to assume a more budget minded 4 seater would sell.

If you like the CH640, why not get hold of a set of plans and build one of those from scratch? I am pretty sure full plans sets were sold.

If you've got time and motivation, I believe a Cozy Mk IV 4-seater can be built for a pretty reasonable price. Unbeatable performance (and coolness) for what you end up paying, IMHO. But it's a lot of work.