personal Id say use them to power up the rune you're using unless you need the coins to spin for more then sell them

Hi! In my opinion, it is usually more beneficial to feed them to other Chakra runes to power them up. As it usually takes quite a bit to power up other Chakra Runes. Selling them only gives you back coins (a portion of the coins you spent), which is usually much more available.

~Jib