Discount on other consumables for Kickstarter backers

I’m really glad that Formlabs offers us Kickstarter backers a monthly discount coupon for purchasing resin.

However, the resin tank for example and the resin get consumed almost at the same speed sometimes. How about making it so that if we do not need resin this month, we can use the coupon for other consumables, like the resin tank? So then we would get $20 off the resin tank with the same coupon, instead of spending it on resin, if we don’t need it.

What do you guys think?

I would love a discount coupon for resin every month, and I think I should get them also since I was an involuntary backer!