In some cases it’s been years since I used a reroll on many of the artifacts that I want to keep. Perhaps you could reset the reroll every 18 months or something. the last time I participated in a lucky reroll event, I spent +/- 11,000 crowns. It seems to me like BHG made some dough on all of those crowns. Althoug, 100 crowns per reroll has always seemed a little too expensive.