Multi User means just that means many people can be in your multi-user show and yes if they are typing in whisper only you would not see other people typing in chat so you started the show in Multi for a lower CPM rate and yes many times other people was not in with you there is that chance they could be so if you only want model and you select private only if model only has Multi option ask them to change to private only and they will do so BUT they may charge more CPM for private only ! peace 
Most models have Combo-Rates, meaning you can select Exclusive or Multi shows. You should see rates listed like 60/40, 75/50 etc. if they offer combo and you select if you want all the action or you don't mind if somebody joins and watches or maybe even joins the fun by tipping etc. You can also ask if a model accept "Offers" in which you can negotiate a lower rate for a minimum time and you can get exclusive at whatever rate she agrees to. Keep in mind that if you leave before time negotiated is up you still pay for full minutes agreed upon. Offers are a great way to avoid getting time cut short from tipping if you get really involved in the action, and it keep others from sneaking in and spying or trying to steal the action.
BTW if the model leaves before negotiated time runs out, or you get disconnected due to technical issues, you can scroll to bottom of page and contact "Live Support" and give them you information and they will usually return the unused portion of the agreed credits....
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