How many H1-B or non-H1-B jobs are “high 6 figures”?

That’s a tiny, tiny minority of the tech employment market and one which would readily shrug off a one-time $100K expense. (That would be less than 2 months’ salary for a high-6-figure position.)

Most of my friends and colleagues ended up in that range (or higher).

It’s more common then people think

$600K+ is around 1% of the US tech market and tends to run in clusters (so your circle is more likely to have people near you in comp than a random selection).

I'm not doubting your first statement. For your second statement, I think people probably estimate it reasonably accurately as "rare, but not extraordinarily rare nor unheard of".

IMO the “tech market” is uselessly broad. Why include Google fellows with desktop IT at a regional insurance brokerage in the same group? I don’t think it helps set policy well for either group.

You are in a bubble.

if theres higher supply, then companies pay less.