If you have a workshop and are ready to tune a large number of vehicles, there is available stream licenses (i.e. per ECM type, not individual ECM's)...
these are more expensive, but they are "big-picture" cheaper if you will be tuning many vehicles (as you said above... I was typing... ).
If you buy V2 Scan and Tune (with 2 license), and add licenses (at $99 per license)... then at any time you can upgrade to a workshop stream, your existing licenses will be used as credit to reduce the cost of the workshop license, as Justin said above... if you want more details let me know, I will contact Tech Support.