>I think, at $29,95 each, it's a expensive one.

That was my feeling too.

>The space needed for a standard 5/6 pins ICSP
>connector is not much more, but this one is costless.

Well, a couple of one off costs for the cable and laying out the footprint, 
and the recurring cost of the board area (although the latter will probably 
exist anyway, so zero cost). 

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