There is 'general public' and there is 'tech-savvy android users'. The former you have probably characterized correctly, but I suspect you are underestimating the size of the latter. As the grandparent mentions, if people are posting on forums to help support the devs, then at least some people are being persuaded to use the service because they believe they're helping the developers.
Many people do go out of their way to support independent musicians or indie game makers. It's not unreasonable to believe that there are people who want to help support small mobile development shops.
Many people do go out of their way to support independent musicians or indie game makers. It's not unreasonable to believe that there are people who want to help support small mobile development shops.