To go deeper on the idea: Seller wants Y, and wants to do work X to pay for Y. Buyer has to want work X. Unless buyer and seller know each other really well,

To go deeper on the idea: Seller wants Y, and wants to do work X to pay for Y. Buyer has to want work X. Unless buyer and seller know each other really well, Y doesn't matter to buyer. So by focusing heavily on Y your growth is limited to the subset of the network that seller already has and can promote to, that also wants X from them. If you can't bring new buyers it's going to be very hard to entice sellers to join. Given that you'd need a lot more buyers than sellers to make this one work, it's hard to see the focal point of Y working out. Market places are very hard. Good luck with your next product! Keep building.