Okay, based on my observations this is how it works (at least for me):
You buy the more expensive 3 and 5 euro presents and they work like TYL containers, you may get something good, but if you dont get something good, you get utter ****.
The cheapest 1 euro presents, on the other hand, are more or less guaranteed to deliver consumables that MAY prove to be very much worth the money spent or actually even much more than what you have spent; I have stocked an impressive amount of new year's camo paint this way.