Don't be afraid of sharing the numbers publicly. Everyone that will be interested in buying will ask them anyway.
Also, do you have any example of open source company that monetized user data? Has it happened to you?
The reason that I am asking is that it is very rare to see an open source company being profitable without being focused on enterprise market. Stories of successful ISVs should be praised, not met with suspicion. It seems like anti-capitalist concern trolling.