I've no idea why you've been downvoted. The numbers you point out seem to be accurate and not taking external investment does indeed leave you with more equity (as does sticking with the public company and the associated stock awards). I believe Microsoft was another company that didn't take much (if any) external investment.
It's worth pointing out that VC as an industry may not have been very mature around the time of these companies.
I'm not entirely sure I am being down-voted in this case.
I believe my HN account got slapped with an automatic down rating adjustment quite a long time ago (that applies to anything I post here, automatically lowering my comment positioning).
For example, when I posted my comment initially, it was instantly ranked below a gray-shaded 'negative value' comment from a user with a lower karma rating than myself.
Anything I post on HN automatically starts at the bottom of the pile. I suspect if you could check my account it has a flag set on it.
It's worth pointing out that VC as an industry may not have been very mature around the time of these companies.