Why Not Have A Free Spay and Neuter Clinic?

I believe this would be a good idea for a clinic of this kind to help control the animal population. The reason why a lot of dogs and cats are able to breed like they do is because I think that a lot of the poorer population cannot afford to have their pets spayed or neutered. I believe this would be a good deterrent to a lot of stray animals in the streets. I know it would take some committed people to really be interested in this idea, like some Vets who might not mind donating some of their time to helping knowing that this would REALLY help with the homelessness of a lot of animals.