Derived products are rarely seen in marketplaces because this data is better used internally to improve matching on commission-based marketplaces or lead generation in paywalled marketplaces. In rare cases, marketplaces targeting complex and opaque markets, like Leaflink, can provide aggregated and anonymized market data as a part of a paid tier.
There is deep value in listening, testing, and being fascinated with what members value. This is a mindset shift. Instead of just assuming what members want, successful membership organizations have developed ways of listening, fresh thinking about what their members actually want, and strong feedback loops to get it right.
User research, like the way Glossier builds communities around new products before launching, or the way eBay embraced buyer and seller communities to help define their product roadmap;