[Thorrez]

Why wouldn't a 10% holdback work? Would a company consider it "simply a cost of business" to block 10% of people at random? That's going to cause a huge amount of support load and probably a lot of negative press. 90% of data will still be good for analytics.

[delehal]

If the holdback rate is low enough that the data is "good enough for analytics", then you may as well not have a holdback rate at all.