It's not the price, it's the sub-dials. Does a 7753 the same subdial placement as the Ebel 137? What about depth? If a watch has to be made deeper, it's not a 1:1. Nobody has done the homework on this one, and that's all it would take.
As for the IWC, the case for a chrono and a non-chrono is mostly the same, but a chrono is deeper and has pushers. The only common component the aqua and aqua chrono share is the strap. Yes, they look similar and offer us lots of subtle variants, but I see this as an advantage.
Trust me, I wanted to see the Ebel as well. I voted for it and I'd wear one.