Are you saying these many people you know ended up with £100k in their bank accounts, paying less than £10k in tax? If so, they are bullsh*tters or out and out tax criminals. It’s not possible.
And, just as another little tip to aid your understanding, as soon as you take anything over ~£42k in dividends, you’re taxed at 32.5% personally. On top of your 19% corporation tax