The defense level can be totally left out in the old game, however in the eoc, the freedom ability is essential RS 2007 Gold. Always ensure that your range is half or less of the combined strength and attack. Leaf does make a good point, if dual Ascensions are better than Nox and have the same price there's no reason to not get them instead.
Except for the possibility to make warbands using the Nox in the near future which is inviting disaster to happen. No offense to you however, more experienced players were able to replace their Nox bows and similar weapons due to mishaps (forgetting not to refill Prayer, getting it to drop when they're stunned etc) or due to users smiting. In addition, you'll be camped hardcore by waves of welfare seekers who hope to triple their savings, which can increase the chances of you losing it, and make warbands generally uninteresting.
Before the previous bxp weekend was announced, Nox Bow was steady, and was worth around 320M. After the announcement , it began falling a lot, and eventually ended up falling down to 220M (if I'm not mistaken). Then it increased to 300-320Mish.
Could be something similar that's happening, it's very possible it'll return to normal. It's certainly not guaranteed, however, this kind of item is likely to keep crashing due to new items being added to the game each day Buy RS Gold. Grave system make it difficult to lose items in the present and new system currently being developed makes it nearly impossible to lose items to lose items.