For one thing, free.btc.pt can give 0.02 BTC after about a week of clicking on "Watch Video" and changing to another tab.
Indeed, many of the sites now allow you to delay payments until larger amounts can be withdrawn.
People used to complain back in 2011 about 0.01 BTC from one faucet for one submission being too little to bother with.
For some people using those faucets back then that has meant building up more than 10 BTC...
What will those small amounts from today's faucet be worth in 5 or 10 years time.
Also even small amounts can be aged and combined with larger amounts to avoid larger transaction fees.
But here is the real point, imo, of using these faucets and other free BTC sites:
What good is it if one only gets very very small amounts?
https://bitcointalksearch.org/topic/m.1088930