Technically, if you use SP500 as a benchmark, you do need double digit growth. Why would I invest in a business without the prospects of additional returns, es

Technically, if you use SP500 as a benchmark, you do need double digit growth. Why would I invest in a business without the prospects of additional returns, especially when SP500 is nearly risk free? Why should I invest in my own business if I am not going to get at least what SP500 does? Other than buying myself a job.