O

oh well, at least i get a drop each time i do a star....

Well, I just assume that you bought it.
...
What the hell Volvo?! I thought that only TF2 community are treated like shit.
Event MvM tours can drop something in the end, beside achievement badge (can be an absolute ripoff because some drops are sales as low as 1.5 key and to complete tour you must spend the equivalent of 4 keys).

i forgot if is or not, consider i bought the badge as soon the operation started

Second question: is this scenario free?

well, i got nothing by finishing the last mission but now i could get the diamond coin on theory

Hopefully you got something for this, I'll be more disappointed in Valve if don't.