Tkyler explained in this thread the reason for the long delay, and I can understand that the 737CL is a secondary business, but it is a business none the less. Once you hang out your shingle, and release a product, it's not unreasonable to expect it to be supported. Once you take another persons money for a product or service, the reasons for not having enough time to support the product or service really don't matter to the buyers. So, I can see avantime's point for sure, and I think it's a very valid one.
On the other hand, for me, I guess I just don't care that much about it to get worked up. I too came from MSFS, so I didn't realize that the payware world was "different" in X-Plane, to put it politely. I'm still enjoying the 737, and will roll with the punches.
Tim