I'm being quite serious, I'd hesitate to build much of a business around BlackBerry hardware right now. I think for the most part the users have other options

I'm being quite serious, I'd hesitate to build much of a business around BlackBerry hardware right now. I think for the most part the users have other options through their carriers for repairs, and/or will use a hardware failure as a reason to upgrade to a new device (newer BB, or other smartphone). My guess is that you wouldn't make enough long-term to cover your initial investment in random tools and spare parts.