Where did you learn abbreviations?
is gone now and Raspberry Pi makes no money on their
makes !-> their; 1 != 2.
5$ version but has enough sales to break even and use it as a loss leader (Educational purposes).
Omega2's stellar review on Amazon says the expansion board costs three times its parts. I wonder if sales from those subsidize the Omega's cost; do Onion sell it at a loss like one video game console company do for their consoles?
Each platform supports different functions. Did you know you could have up to 5 Ethernet ports on the Omega and it supports native soft AP to act like a router / hub? There are no Ethernet ports and NO WiFi on the Pi Zero.
According to https://community.onion.io/post/15771 the GPIO pins support four ports but they don't come preinstalled or free! Likewise the Pi Zero has 17 spare pins. Pi Zero W for $10 has Wi-Fi and Bluetooth.
There are a lot of things to consider besides price like application, use case, size, ect.
ect. is not a thing; it's etc.