I agree with you BUT you must admit that it takes alot more skill & patience to pull off a great paint job then to slap on some gunk & let it rest in sunlight for a day
The majority of us guys can tell from a block away if a computer we know so well was painted in any way especially when light reflects off of it so i can understand the hesitation to paint on both counts
I would bet you, you can't tell the painted computer. Also, it's not that hard to get a good paint job with these new, modern spray cans. They do an amazing job.
They even make "spray cans" that you can re-fill the "paint". This means you have the same flexibility as using a spraygun (mixing your own colors).