Well unlike everyone else I will try to give you an answer.
In a SaaS company it's all about your customer acquisition costs (CAC). In general the aim is to bring your CAC down to about one year's revenues. If you can achieve that then you are probably doing pretty well. If a VC sees your CAC at one year then they know what results they will get from an Investment in your business. Of course this assumes that your churn rate is reasonable etc etc.