Does anyone have experience on selling the data they've gathered from their web/mobile/whatever app?

I'm not talking about user/demographic information. More interested in using usage data to compile reports on an industry that might have some $ value to other businesses. For example, if you had an invoicing app and gathered information on companies industries could you sell a report on average invoice size and payment terms by industry?

I have a couple of SaaS apps in the property industry which gathers quite a bit of information that I think could be useful (without including any user/demographic data) but not sure where to start with this or even if it's worthwhile.

Does anyone have experience of this and do you have any advice on where to start?