Short answer? Yes.
Longer more in-depth answer?
Still yes, but the cost of MLS itself is only the tip of the iceberg. There are annual ongoing continuing education costs, MLS fees, Association Dues, Scheduling Service fees, Supra Lockbox purchases (those suckers are expennnnnsive), Supra access (to be able to use and open those lockboxes), all this and a lot more comes in the Realtor starter kit and more with a pretty hefty price tag.