Doesn't show Monthly estimate in Web Portal

Hi,i am a new user of the Ooma Office,setup and running work like a charm,but only 1 thing that i dont like,whenever we try to add extension,user or anything to my account,its never show me if i do this,how much its gonna be for my bill even its just a estimate,come on Ooma,ppl buy your device cause they are a small business,and they try to low the cost as much as they can,its should show how much estimate before they can submit to add extension or user .Thanks