Personally, as a second amendment advocate, I am glad that some have that many.
Theoretically and practically, if we want to keep our government honest the best policy is that the people are armed. I have observed your posts enough to know you are entirely familiar, but will go on to say this sends a message to our government, our servants not our masters, that with hundreds of millions of guns [current speculation puts it at around 300 million I think ] out there that we still have the overwhelming numbers in fire power, not they.
It is scary the tools that government is developing that could eventually be used to combat We, the people, however... and as a watcher myself, and even though I liked that we won, I was suspect of the surge as a potential example of methods and then practice in counterinsurgency which could then eventually be used more successfully against Americans. Piggyback onto that it seems that we are driving the true patriots out of the military, encouraging less and less to even enter, what with current policies making it an environment unpalatable to most. With the social engineering and rules of engagement such that many normal Americans would not and do not feel comfortable nor safe... that our military, if it continues on this path, may eventually become another of those tools to be used against us.
If you are also watching in other areas, there are recent polls [even tho I am not a true believer in most polling and results] indicating that most Americans would struggle to cover $1000 in a crisis situation, then most Americans probably are not spending money they cannot afford on a gun purchase. Not with a minimally working shotgun at probably about $120, handgun at least $200, not to mention ammunition. So perhaps it is good that those that can afford such buy more so that in times of potential crisis/need, we aren't left wishing we had them. The analogy would be the homeowner being without one when someone evil has broken in/ Wishing they had one doesn't make it happen.
Also, keeps the gun manufacturers reasons to continue making them as people buying them results in profit.
I see only good if there is good intent, If the person has bad intent, yep, could also be bad.