Just no benefit in it. The hole size would need to be quite small not to leak at DBS frequencies and there would be very little wind-force reduction. The whole point of DBS was to be able to use a dish so small that wind wouldn't grab it in any kind of manner as with C-band size dishes. And also so small that its obtrusiveness is a couple orders of magnitude less than the C-band sizes where making them semi-transparent (through perforation or mesh) was deemed an aesthetics benefit as well as wind-load reducer.