I don't see in that passage that we were saved because we were worth it. Instead in the context I see that a cheap sparrow that is worth only a half a penny doesn't fall to the ground without the Father's knowledge and we are worth more than that.
But let's look at the context. The verse before it says:
"Do not fear those who kill the body but are unable to kill the soul; but rather fear Him who is able to destroy both soul and body in hell."
After, it says:
" “Therefore everyone who confesses Me before men, I will also confess him before My Father who is in heaven. But whoever denies Me before men, I will also deny him before My Father who is in heaven."
I don't think that the "you are of more value than the sparrow" means that Jesus died because we are of such wonderful value - but instead, it's showing that God watches us too, just like the sparrow.