Poetry and the like are nice gifts, but they aren't sacrifices.
I would argue - you ARE sacrificing the time it takes to make a poem, dedicating yourself to a craft. You might not be giving up an object or spending money, but you've made something
for a deity and give it to them. Now, I understand we might want to get into a discussion about offerings versus sacrifices, and I'd wager that our definition of those two terms might differ with our own practices.