Without knowing performance of other channels, if I found something that I was fairly confident was delivering break-even ROAS on a 1yr value as a SaaS marketer

Without knowing performance of other channels, if I found something that I was fairly confident was delivering break-even ROAS on a 1yr value as a SaaS marketer, I'd do this all day. There are so many opportunities to reduce churn, increase LTV, etc. that tipping the scales to make this channel profitable are probably pretty doable. The harder part of marketing is finding a channel with strong signal, and breakeven ROAS is absolutely strong signal.