We chatted with with Apaar, founder of The Design Cart ($80K/month). In our interview, Apaar says:
Building a two-sided marketplace was always going to be a treacherous journey and a typical chicken and egg story. The supply won’t come unless you have enough demand and the demand won't look at your platform till you have enough supply.
What kept me going was that I knew in my head that we were trying to digitize an entire supply chain and hence the challenges had to be enormous.