I had another sign-up the other day who hasn't activated their account yet - waiting to hear back from them.
Their number is in the 7000 range - showing that ML is still growing at a fairly even pace right now. Although based on my 'proof' of search engine dominance, I doubt very much that most of those people have activated their accounts - which is why any sort of affiliate program that is 'fr'ee' to join has maybe 1% or 0.1% of the affiliates actually doing any marketing and selling. The rest is just dead weight.
Here's my page 1 ranking for [mammothlist]

And here's my page 1 ranking for [mammoth list]:

