It seems to me that the folks at Infopop are quite fond of releasing premature updates. I have owned my license for maybe 5 months now and the UBB has had 8 or 9 updates released. Right now, I am planning on upgrading when v6 is released. Hopefully in the future, with UBB V6, there will be fewer minor upgrades. Lately I have been slacking on the site updates.
Updates are VERY important.
In the beginning, I updated the site once a week. Since my updates have slowed, so has my traffic. I plan on getting back to weekly, and on some pages daily, updates soon. Keep your content fresh, but more importantly, keep your content interesting. You could update hourly, but if you don't have anything worth reading or viewing, nobody will visit.