AdBlocker Privacy Pro

I'm entirely flummoxed by this developer: • He has 20 different apps available. • The only way to obtain his software is the Mac App Store. • There are extremely few reviews of his software. • None of the few reviews are particularly positive. • His only web page is for support requests. • The one reviewer who tried his support page received NO response. Clearly, English is a second language for the developer, evident in descriptions of his software. That's of course a hinderance. But the overall impression I get is that he has no concept of effective exposure/marketing of his software. There are the broken English descriptions, but what is the customer actually buying? There have recently been so many thoroughly bogus apps (think MacKeeper), why would anyone spend money on a potentially worthless POS? This problem is compounded by the fact that Mac web browsers already have remarkably and persistently effective AdBlockers for free. Free. So why pay $3.99 for some mysterious alternative? I very much appreciate having another anti-tracking app available! 'Cookie' needs competition (and 'Cookie Stumbler' barely qualifies). I'd very much like to TRY OUT the anti-tracking features of AdBlocker XustoPrivacy. But I don't have $3.99 to spend on an experiment. This developer started providing apps in 2015 and from what I can tell he's not selling much of anything. The reason why is that there is no such thing as a paying bleeding edge user. Everyone wants a taste before they buy the dinner. The testers will then post reviews and potentially purchase. Readers will then decide from other's experiences. The purchases will then either climb or remain dormant. Summary: Is this app worth buying? How would I know?