There were only 2 responses from women earning $100-150k. A suburban woman answered 'No', an urban woman answered 'Yes'. The vast majority of the remaining surveys were filled in by women earning $25-49k, which isn't OP's target audience. However, most women earning <$75k answered 'Yes', so the market might be large enough after all. Maybe not for haute couture, but for reasonably good prêt-à-porter, sure.