This is where other solutions such as the Q&A plugin for Confluance have their place. The Q&A plugin for 1k users is $1000/year (on top of the $24k/year for the 1k users)... but that's a small fraction of the price for the enterprise cost.

... And lacking the integration with other systems, the enterprise version of SO (and for that matter, teams) really lacks a good price / integration / use pitch.