Many entrepreneurs building their own companies take very little in salary for themselves, preferring to pump profits back into their businesses for expansion.
That is what I did for the 43 years of building my first company. I paid myself just enough salary so that I could contribute the maximum allowed premiums into the Canada Pension Plan (equivalent to Social Security in USA, I believe). I was thinking far enough into the future to allow myself some sort of retirement income. This was not then, and is not now, a rich person's wage. Current maximum employable earnings for Canada Pension Plan purposes are $52,500. At that income level employees contribute $2425.50/yr, an amount matched by an equal contribution from the employer. Contributions at the maximum rate for 40 (or more) years of employment ensure a current pension benefit at age 65 of $1038.33/mo.
Successful entrepreneurs most often don't capture their true wealth until the sale of their company. I realized some of my own wealth when I sold part of my company in 1995, allowing me to purchase the first home that I ever owned. I was 46 years old at that time. My big wealth arrived when I sold off the entire company thirteen years later. I lived the life of the big-spending nouveau riche asshole for about two and a half years, bored out of my gourd.
Since starting my second company 3+ years ago I have paid myself exactly $0/yr. All but one of my current employees are paid more than that $52,500 salary that I mentioned earlier. I have been a demanding employer for my entire career but I have also been a loyal employer and a generous employer. I have no guilt about enjoying the wealth that I created and I will defend that wealth with vigour and tenacity from any pitchfork-wielding horde.