Someone check my math here:

Vader ratio is 5/200.

Each week there are 5 toys not including Vader.

Taking away Vader, the ratio of each toy is 39/200.

Toys are available for only a single week each (barring any carry over of stock).

Each week, Vader remains available at the same ratio.

The promotion runs for six weeks (30 toys; 5 per week).

Vader is available for all six weeks.

5 Vader x 6 weeks = overall ratio of 30/200 (if all the Vaders were released in a single week).

Now, unless my math is wrong, and it could easily be, Vader really isn't that tough and anyone crazy enough to pay much above retail really is crazy.