Early-stage demand for mkt/sales/biz dev consulting?

Wondering if there is demand by early-stage startups for marketing/sales/business development services via consultancy?

From my own experience on a truly cross-functional team, the coordination amongst eng, marketing, biz dev, etc. is what helps our business thrive.

Seems to me many start-ups build a product then go "find someone to sell it." Would it be a better fit have non-tech biz strategy folks consult from earlier-on to help steer product development to market more effectively?

Share thoughts :)