That does sound pretty neat. The contracts seem fun but they skins look terrible imho so maybe if I could try selling them though.
Still I'd need about 40-50 cents worth per drop which seems unlikely at this point, unless their prices will go up after the campaign is over since they are limited items, but who knows what Valve has planned.
...Hm, maybe I'll give it a shot anyways. Even if I don't get all my money back it'll still be a lot cheaper in the end.
EDIT: Actually I made a mistake there. It runs for 3 months so about 13 weeks. 600 cents divided by 13 is about 46. (So each drop needs to be worth that much to make your money back.)
But you get two contracts per week so each drop only has to be worth half that amount (on average).
(EDITEDIT: Also it's only in € its only 5,50.)