I got a Macbook Air from work. Stuck Ubuntu on it, and a big kayak sticker over the Apple logo. They aren't getting free adverting from me. (One fanboy looked noticeably upset when he saw it running Ubuntu).
I like how someone who uses the same hardware as you but a different OS is a 'fanboy', but at the same time you are completely exempt of this moniker even though you take part of your identity from the fact that you cover up a logo and run Ubuntu; feeling proud enough to tell us about it here.
Fanboy-ing aside the benefit of OS X over Ubuntu (et al.), to me at least, is that it is more stable, still unix and there is much more software available for it that doesn't require debugging/building/re-building, etc. Ubuntu is fun for playing with, but when I need to get work done it tends get in the way eventually.
I'd be annoyed too to see someone never take a Porsche past second gear and cover the logo with 'Honda'. None of my business, but still saddening to see someone so miss the point.