When I went on the WMS/SG tour in April they explained it a little better to us. They sell/lease their machines with a certain range of payout percentages in steps, like 85-87-89-91-93. Those steps are the only choices the casinos have and in Las Vegas if the casino is server based they are able to change the payout percentage whenever they want BUT they can't do it while someone has money in the machine and the machine has to go down for 15 minutes while the change is made. The casinos that are not server based, they actually have to go in a change the settings individually and that of course takes time. Either way there's paperwork that has to be filled out and signed and filed, etc. So, while it may be easier at server based locations, there are still rules they have to follow.