Can you start on a low budget?

I'm starting a new business but only want to spend maybe $100- $200 per month starting out. CAC in this industry ranges from roughly 50 to 150 . Lifetime value is over a thousand dollars conservatively.

People are telling me running ads is not worth it without doing like $50 or more per day. (and some of them surely are in heaps of debt - but I want to take a more risk averse approach).

What's the problem with starting slow other than getting data slow??