My Nintendo - Did anyone else get gold coins for a 4.99 game?

[Darwinianevolution]

I don't know, I have yet to see a decent discount outside of those free Picross games, so I haven't paid that much attention to the gold coins. I also have one question: if one day I spent 17€ and the next I spent 3, do they count as 20€, or do they reset after a while?