Cheap Online MLS services

I've come across some sites that will post your home on the mls for a few hundreds dollars thinking your home is going to get the same exposure as if you would with an agent.  Well that is FALSE, they may list it on the mls but agents arent going to show it if they are not getting paid a commission and they only people that have access to the actual MLS are real estate agents.  So if you are looking to sell your home FSBO be aware of these sites that are just taking your money.