In 1986 I started my first business. Sold it in 1988. The next business I sold in 1998. I've run businesses in food, automotive, property, tax, music and inevitably - marketing [to name just some].
You need cashflow, want results and to see new clients. Additionally, I fully appreciate [from my own experiences] you have a choice of where to invest your money when it comes to growing your business - ROI is vital.
What I execute for clients hasn't been learned from a book, a weekend course or taught me by my some franchisor. It's all from 34-years of trial, error and fine-tuning.