It's really not a big deal and I don't view it as gathering attention. I do it because it makes it easier to shift to 2nd. If you shift from 1st at 4000, the shift to 2nd will only have it at 2300-2400rpms. If you carry it to 5000rpms, your shift to 2nd will be at around 3000rpms. For me this works better because the revs aren't dropping so low. I'd suggest trying it.I'm kind of confused by this thread. Don't see an issue with this at all, but for what it's worth - obtaining an upshift to the next gear can also be achieved by a blip of the throttle, then allowing the rpms to fall a bit and then easing out the clutch. That can be done by reaching about 1500 - 1800 rpms. Even less. Riding the rpms to 5k and then shifting isn't what I would do leaving a traffic light or in the middle of town unless I was looking for attention.
MOO & FWIW