We're comfortably off, rich compared to many people but we'll never be super rich as I don't have the drive or necssary attitude to risk in investments. When we were both earning we were in the top two percent of household incomes in the UK. But we weren't earning six figures. We now have only a 25% mortgage and close to £100k in the bank. However the two are offset so if we clear the mortgage most of our saving are gone instantly. I also don't work now so our income is halved.
I got a small inheritance (though it was all they had) when my parents both died in my teens which, in combination with dh's lucky first house purchase that cleared 100% profit, allowed us to put a substantial deposit down on our first joint house of over £80k cash. That's probably the biggest single thing that has helped us over the years, lucky property returns.
I have friends who are much, much richer than us and always will be, and can tell you exactly why. They work for themselves, are seriously driven & ambitious, work scorchingly long hours, and invest very wisely & widely with a sideline in high risk/high return opportunities. Everyone I know with lots of wealth has followed this pattern. And, even where it has been inherited, the family wealth has always started out this way.
So:
Work hard and smart, work long when necessary, invest wisely.
On a side note, to me super rich, never have to worry again rich, is probably £5m+ net worth with at least £1m+ cash in the bank.