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Sure there is. With over 600M devices manufactured, we have enough information to assume the numbers are in the millions. You would have to assume that an extreme number of those devices are no longer in use to even come close to being under 1M.
Those are general device numbers. On top of how many might not be in use and all that, how many of those devices visit the site or sets if sites that were gathering the stats? And then only about 3/4 of a percent of those seem to have had iOS 7 beta. I don't think we can really easily tell one way or another, but given the rather limited distribution of iOS betas (and even accounting for a way to install the betas without being a developer and all that) there are just too many people out there with iOS devices who barely know how to change (or even about) half the settings that exist on them, let alone even know about betas and then even (assuming they would even want to bother and risk it) able to get them and install them.
 
Those are general device numbers. On top of how many might not be in use and all that, how many of those devices visit the site or sets if sites that were gathering the stats? And then only about 3/4 of a percent of those seem to have had iOS 7 beta. I don't think we can really easily tell one way or another, but given the rather limited distribution of iOS betas (and even accounting for a way to install the betas without being a developer and all that) there are just too many people out there with iOS devices who barely know how to change (or even about) half the settings that exist on them, let alone even know about betas and then even (assuming they would even want to bother and risk it) able to get them and install them.

Sorry, but the statistics hold up that there are likely millions running the beta. Argue the point all you like, but that's what the stats point to.
 
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