Considering the amount of malware, spyware, marketing-ware, grab-all-your-phone-contacts-and-upload-them-to-our-server-ware on the marketplace these days, my bar is quite high and I'm happy for it to remain so.

For a new product/app, the onus is on the company creating it to explain why I would want/need their product. I'm not going to go around installing random things on my phone just to 'find out what it does'. I want at least some idea of what the app does before installing.

No compelling use-case? No download.