Yes, cheating would defeat the fun and I guess 50-90% of people won't do it, but this community has a tendancy for loving marble skins enough to copy them to other mods. The missions? depends how lazy they are. Sharing (or changing) appropriate files can also lead to unlocking the entire shop, such as writing out the values in prefs.cs. You have many many problems posed in front of you.
"matan, now i get what you meant a few years back when you said that "the level in mbg is beyond me" after the last rampage i noticed things were insane, and now i truly feel that too" - Dushine, 2015.