Just don't make it more expensive than the Windows version
I bought a laptop from Dell back when they were still selling the Ubuntu option. I intended to run Ubuntu, but when I was selecting the options, I saw that (for some reason I don't fully understand) the Ubuntu version was more expensive. Maybe the extra cost was in assumed support, but regardless it strikes the brain strange to charge MORE for a free OS than for a paid one. I figured I'd save money and have a Windows license in case, so that's I bought it with Windows and then just install Ubuntu. Had it been the same cost or lower I would have bought Ubuntu. Don't shoot yourself in the foot here by charging extra for this stuff, especially when targeting developers. We still glorify the self-built, self-modded setup, so I wouldn't bet on being able to charge extra for "ease-of-use".