They are offering recertification for exisiting auditors, thats whay there appears to be so many courses. They do run new auditors courses but not as many.
There are about as many auditors as the IATF wants, but not necissarily as many as the registrars would want. I work for a registrar and we are always looking for good TS auditors. It is not as easy for TS subcontractors to switch from registrar to registrar as it is for ISO. TS auditors are sponsored by a particular registrar, and while they can audit for two registrars there is a fee to doing that.