If you want to ensure a SB-free duty, then use the party finder. Don't expect to be able to remove people's ability to make gil while grinding content if you are just queing in via the duty finder. More often then not, people with SB accessories generally have i90 or better in all major slots. That pushes the iLvl down to about 75 or so, which is still 20 ilvl's above the "requirement" to do expert duties.

It could be worse - you could get someone showing up in full DL & i60 jewellery. Can't really kick someone for not having better gear to equip - similarly you shouldn't be able to kick someone that decides to SB their accessories..