It's probably because a lot of the staff give off the impression that if you have a different opinion than what they have then you are wrong for thinking that way. Not saying that this happens all the time, but when users here criticize parts of something that most users do not care to notice, even if their intention is to make it better, their comments are seen as being negative.
The resource system is alright in concept, but the standards could be improved so that what is submitted to it would be useful to users and not just cheap credit to get to the Spam board. It is an unrealistic goal to try and get those not into game development to submit five resources every month; it only becomes realistic when those resources are not their own or the resources are rushed to a point of being useless.
I think that if the month time-period of activation were to be lifted, that no adverse effects would be felt on this forum and having individual users only need to submit five good resources to be in Spam indefinitely would be a more practical approach. As I said previously, having only a few users submit five resources each multiplies and the effect would be greater than people realize. However, the way it is now, there are going to be people who just give up or do not try because the effort to gain access defeats itself every month.
And really, the Spam board itself no longer appears on the Recent Posts list so it isn't like it would be that distracting, and if it became apparent that the board was getting overly used, the credit amount to get in could be slightly incremented so that the over activity that could be occurring would dissipate and people would find it easy to submit just one more good resource.
Either that, or decreasing the credit number per month and keeping the time limit would work better. Decreasing the number would be easier and would probably have the same effect. The goal should be more oriented towards getting quality resources rather than a lot of resources and the goal should also be less about constricting the Spam forum and more about getting good resources easier.