I say sure because how many tokens you have is only limited by how much you are logged in. So 24 tokens in an hour(4/10min right?) equates to 192 tokens in a night of rest(8hrs). You could spend them on other stuff like consumables or upgrade stones to make + gear with but I guess its up to you. Personally I think it's a bad idea, considering the best thing I ever got from one was a Rare necklace with resistance(that you can buy for ~5m) and sucky Legendary L21 Namek armor.
Then again you can sell the red and blue chests so maybe it'd be worth it to make Zeni instead and just buy what you could potentially be spending 80 tokens on.
I think you can only sell Red or Blues, I am not sure of the price it's been awhile since I checked them I stopped picking the low level chests up lol.
DEPENDS on the level. 35-50 and 51-55 chest all colors are worth opening. 21-35 arent really that good but if u have tokens to waste why not open them up