I suspect that they are not on individual commission but that a % of the store total would be shared throughout the team.
Also
@Diamandis even if your SA is not on individual commission he will still have sales targets so if you appreciated his service it would be nice to shop with him again.
I work in Luxury retail and we have individual targets but our commission is pooled from what the department makes as a total.
Hope this makes sense.
This commission structure makes for a nice working environment (teamwork makes the dream work) and also encourages honest salesmanship.