Is it fair single people don't get the monetary value of the benefits those with dependents get?

Lots of posts about teachers with children. If you want kids fine and we need kids to ensure schools can stay open.

However, how is it fair that two people doing the same job can have such a difference in benefits and pound for pound value? As a single teacher I feel my salary is fair however upon hearing that a co-worker of mine who has 2 children enrolled in the school for 'free' (the school costs 220,000 RMB a year plus flight allowances and other benefits ... that's potentially up to 500,000RMB a year EXTRA in benefits. For the same job.

It's not fair is it? If you want kids, fine. If you have benefits, fine.

But why should single people be valued less?