When I bought my third class this happened. I had $54,000 and after I bought the class I still had all my money. Also off topic, I noticed that before the cinematic intro is over I can upgrade my skills before I even see my pro. I have a feeling this might be a connection to the host issue though.
This happened to me as well. When you buy it, it substracts the amount, but if you go into a different menu and return, you'll have the money back again.