Taking your business to the next level implies that your marginal costs (e.g. for the acquisition of new business) will go down. But that doesn't mean they go to zero. But, what does it mean?
You still have to spend money to make money. And you also have to check to make sure that what you're doing works.
Scaling is particularly challenging once you decide to pull the trigger. How long do you let something run, if you think it's not working, before you pull the plug? (And do you really have the resources to stay in the game?) And then what metrics are really reliable to give you accurate feedback from the market? Hint: Do not believe your Marketing Manager!