Difference between levels of Lifetime Membership


On the above URL, it is written that

1000 points gets you a free lifetime Bronze Membership

2000 points will get you a free lifetime Silver Membership

4000 points, well, this is the granddaddy of them all because you’ll get a totally unlimited, free lifetime Gold Membership

Maybe I’m missing something, but what is the difference between the three levels of Lifetime Membership.

Additionally, I just realized that my Rep. Points were at 94 earlier today and for some reason, they have gone down. Have I done something wrong? Can someone provide reasoning for this?