Mobile app sugestion: selling / buying books

I am using librarything service for many years and I am quite happy with the web app. Yet I am missing a very important feature in the Android app: acquiring books between members.

I am having approx 1000 books and always looking foward to make new purchases to complete a collection, or to start (reading) a new one.

Czechia is a country of book lovers, with large network of public libraries, even in the smallest towns. Yet still, a "find / sell a book" is very popular, so probably adding a place to swap/offer book for sale (and a comission for you) might be good to support your business case at LibraryThing. A very popular service here in Czechia is TrhKnih.cz or reknihy.cz, taking the advantage of a vast barcode/book DB to find and buy/sell book. Also the TrhKnih.cz has a very good "proof of purchase" to validate a sale has been done via codes generated during the book handover provided to both parties, entered when books are provided by selling to purchasing party, while purchasing party is paying book on TrhKnih account, and after the prrof of handover sent to the seller.

Please consider this, I guess I am not the only one looking for such feature.

I will be happy to provide you with more details as I would love to see your service becoming more user friendly to the needs of the book-lovers.

Thank you for taking this improvement into consideration.

So what you need is access to the Librarything Local in the app so you can go to all the various book places near you?
I don't want the app to become a sales platform, because then authors will try to ruin it like they ruined GoodReads and Amazon.