What are the costs exactly? Wifi operates in the 2.4Ghz band which is license free worldwide.
(As I understand in some countries you need to get a license to sell wifi devices - some Arduino's have issues with this - but not to use or build them).
You still need to meet the FCC specs for not causing interference (in the US at least), which can be costly. And you can be sure that a bare board with no shielding around the RF sections is going to be pretty noisy.
Comments
What are the costs exactly? Wifi operates in the 2.4Ghz band which is license free worldwide.
(As I understand in some countries you need to get a license to sell wifi devices - some Arduino's have issues with this - but not to use or build them).
You still need to meet the FCC specs for not causing interference (in the US at least), which can be costly. And you can be sure that a bare board with no shielding around the RF sections is going to be pretty noisy.
I think the OP's talking about those who want to implement the boards on their own, where you do have to worry about all those certification costs.