This is only true if you are selling a relatively low investment product. I also work at a SaaS business and can tell you there is absolutely no way we could m

This is only true if you are selling a relatively low investment product. I also work at a SaaS business and can tell you there is absolutely no way we could make sales on marketing alone (and we sell to primarily SMBs). Whether or not you need a sales team depends greatly on what type of product you are selling.