Line of Credit

Here’s the truth. Up until this year I’ve DESPISED debt.
What changed?
The idea of leveraging debt, rather than being a slave to it (like I’ve always known about) I can potentially get a line of credit, do a massive marketing campaign after significant amounts of A/B testing have shown a valuable ROI then after I use the line of credit complete the work, close the jobs out I can immediately pay the line of credit off.

Leveraging Debt: How have you done this with marketing?

How much market research A/B testing in small batches etc do you complete before dropping $10,000-$100,000 in that marketing avenue?