As long as your product is perfectly scalable and generates a profit for money spent that way, it makes perfect sense to take a loan, spend a fortune, make a fortune, then pay off the loan and take in profits. Then turn around and do it again.
It isn't the absolute size of the numbers that matters. It is the ability to rapidly scale the business once you have the right business model and product.
And in particular, if you sell low churn saas (like we do), you can comfortably spend the first year's annual contract value on customer acquisition and have an extremely profitable business. Just huge initial marketing costs.
And quite possibly huge ongoing marketing costs! But if churn is low, or even negative, you can assume something like 10 year customer lifetimes, with a comfortable 5-ish percent cost increase per year, on sale for the first year's contract value. If you have cheap-ish money available, you should buy as many of those as the world is willing to sell.
