What I miss in the discussion about paid applications and the lack thereof on the Jolla Store, and on Sailfish in general, is the fact that on both Android and iOS, the most installed apps by far are those that don’t cost any money at all. Most of them are made by big companies (not coming to Sailfish), governments (not coming to Sailfish) and some other smaller-but-useful stuff like file browsers (already available on Sailfish).
Then, the most installed paid applications are also all made by big companies (not coming to Sailfish).
The most installed games are those that don’t cost anything, either made by big companies (not coming to Sailfish) or viral successes (could technically come to Sailfish), and the most installed paid games are made by big companies (not coming to Sailfish) or are knockoffs of games made by big companies.
Therefore, from a user’s perspective, I don’t see how adding support for paid applications would have any significant impact on the availability of native Sailfish apps at all. The only way for Sailfish to become bigger and get more applications is to be bigger and have more applications.