Unfortunately I have discovered that the cost of the Rotor Commercial rating is 3,500. You start with 5,000 and your first PPL costs 2,000.
So the REALITY is that you must suffer through the Cessna 172 for PPL, Commercial, 2 first flight missions, and then 3,500 worth of commercial missions before touching a helicopter in career mode … or any other plane as far as I can tell at the moment.
[edit] - Started seeing plane options change up once you have Commercial Cert