I live in a rural area where not a lot of people are likely to respond to those looking for care. So what does care.com do? They make it mandatory to pay them in order to respond to a pet care wanted request. I watch the same ad sit there for weeks without the position being filled because care.com thinks it's a good idea to make people pay in order to respond. They gave me a lame excuse about listening to their users, but that is certainly not applicable to the area I live in. Maybe their paying users want exclusive rights to these jobs, but they are not getting filled where I live.
I also never, never get a response to the other type of ads I respond to, so I really wonder if this site is worthwhile to anyone but the company running it.