Pro tip:
Don't get the Dizzy's upgrade until you have enough money to spend on upgrading it. You need to spend a lot of money to make a profit with it. Then spend your money into marketing, that way you get awareness for your Dizzy's.
The most successful dizzy's I run right now gets me at least 5 thousand pound per day.
Also can also get awareness for your Dizzy's if you unlock the Dizzy's underground complex feature.