yep, look at this chart:
http://bitcoin.sipa.be/speed-ever.png

The difficulty stayed at 1 the whole first year (2009), because there were only a handful of nodes on the network.  In other words, at 2 MH/Sec, you could have mined almost 700,000 bitcoins the first year with just a middle of the road dual-core CPU.

Which would be worth around $10 million now.

Read it and weep  

http://bitcoin.svn.sourceforge.net/viewvc/bitcoin/trunk/main.cpp?view=markup&pathrev=1
Line 2213.

Looks the same.

I know at least 10 people who were using bitcoin in early 2009, but I'm not sure all were generating.

No, the same as the one that's included in the official client.

The reason for not mining would be turning off computer at night, not wanting to waste cpu, forgetting to start bitcoin after reboot etc. Since they were worth practically nothing the incentive for generating coins were low.
I generated for a short time when I first discovered bitcoin, but then I forgot about it for some months, and never started generating again, since getting maybe one block every few days was not as fun as getting 5-10 a day.

Ok, so at 7 blocks a day is 350 bitcoins/day. That would give you .350 MH/S at a difficulty level of 1.  So the original client only had a performance of maybe 350kH/S?

Ok.
The entire bitcoin economy is only $100 million.  Which is a rounding error in Bill Gates' dividend calculation.

You must belive that bitcoins are going to take over the entire economy to get up to his wealth.