They should be taken into confidence that here joining is free so, they have nothing to loose. So they will have no objection to join here. Then gift some Tcredits from your genealogy to that ECA so that he /she can list his / her product on the TC. So again he is paying nothing to do this job. When traffic clicks his / her product for checking out, then the magic starts. Once this ECA is paid, then this ECA will automatically be convinced.
I think this process will have a good result.
