In some respects the sky type dish is a good design although they may come off the production line costing under a 10 GBP, but installed in millions. The oval shape, albeit coupled with an oval aperture LNB, reduce the weight as do the perforations which also have the advantage of reducing windage which could negate the need for much stronger fixings. A consideration to be made when replacing it with something bigger and with a greater wind resistance.
My oval zone 2 dish (installed in SE of England) is just starting to show signs of some rust after 14 years. I installed it as delivered - no painting.