I'm just speculating here, but I think one of the reasons for the appeal/interest from overseas is the image of bbq... the idea of a great American past-time - bbq'ing/grilling in your yard, with the sun shining and all that. Also, the equipment for this great activity seems to have been commercialized and mass-produced with great success in the States. So may cultures in so many countries cook meat on fire with different techniques - open grill, hot rocks, buried in the ground, etc, but an icon like a Weber grill is distinctly American.
I have sometimes wondered about this as well, and then realized that bbq/grilling/cooking with fire is just a fundamentally fun thing to do, no matter where in the world you call home!! The input we get from domestic and overseas Brethren is phenomenal, and I really enjoy it.
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