As you know, our greatest expense is vet care. Ear infections, parasites, spay/neuter, etc., far outweigh the adoption fees. Sponsorships help pay the bills, and also bring more attention to a specific adoptable dog.
Pacino, now called Jamison, was considered unadoptable because he failed a stress test at the local shelter. After moving into a foster home and developing trust, he was adopted to a lovely woman.