seejohnbike and JesusBananas are my new heroes. Couldn't have said it better myself.

And to fuji86, of course we all know that a perfectly true, tensioned, well balance wheel provides smooth riding. I built my wheels radially and laterally true to 5/1000 with a dial gauge, and I know my rims are perfectly balanced becoz the little 1 inch piece of Araya sticker always always falls right to the bottom (without tires or tubes). But after you add everything together, it's too ridiculous to obsess over the little things that will alter weight esp when the differences aren't directly noticeable. Things like valve stems, patches, tire wear, etc.
Sometimes my LBS only have 48mm valve instead of 34mm. Do I take it? Yes, it's not a big deal to me. And while patching tubes might cause imbalance to the wheel, it's just too OCD to obsess over it. Plus not having to replace a tube every single flat is just more financially and environmentally appropriate.