I tend to sit between 0-5 because I like to mincost most events, since I didn't bother with Eterna and I didn't have to spend any for the last few events I had a bit of a stash. I was sortof running off the assumption that since we've had several collection and farm events, we'll get a couple of gold/star rushes back to back and I'll be able to restock a bit before the next collection.