Are they seriously abandoning their account to make comments on reddit that will never earn them a cent or collect curator rewards on another site that doesn't yet exist? Steemit is the only game in town (that pays in something other than karma hugs) and likely the payout today will increase over time if the site is successful--so either these people are irrational or full of shit.
If they are the 1.3 billion from Facebook, they aren't likely using Reddit either with its 0.16 billion usership. There are so many different things that users can do on Facebook. Steem is so one-feature-wonder.
And my point is the payouts are not important to most users.
That's even worse as facebook is a data whore, which pickpockets marketing data on your way out the door,
"Excuse me Madam, did you see my wallet?"
Pulling up her stockings, "We, no! But might you be interested in a fine gold watch?"
"No, thanks -- If you'll just kindly give back my ID, I'll go."
As far as payouts go, you can't have it both ways. Users can't simultaneously hate the payout scheme and not care about it. They can act like both, but the reality is a degree of one or the other.