How many people hold all the PMI certifications?

I have with interest read the back and forth messages on this thread. Actually the discussion transcends the project management field and could be extrapolated to other domains in which the importance of a certificate could be questioned (for instance, an MBA over someone without an MBA but that has launched an extremely successful business, like Steve Jobs). This topic – certification vs. experience – is quite recurring in this forum. In my view, gaining a certification (not collecting) makes sense to prove that knowledge in a specific subject has been acquired to the sufficient level to get certified. It should not be seen an end on its own, but rather as a culmination of a learning effort. People holding several certifications are in my eyes people very committed in becoming better professionals.

Hi Rami,
it looks as if I was misunderstood.
I have nothing against people who passed many certifications.
I am just curious about their motives.
I am involved in everything that you mentioned (program and portfolio management, business analysis, etc.) but I don't understand what can I get with any new certification from PMI.
And so my question was about the value of multiple certifications. People spend time and money to get new certificates for what? Does it help for promotion and finding customers or what?