Have you noticed that rewards keep shrinking but rarely will faucet owners lower the minimum withdraw limits.
Isn't that interesting?
the 2 things arent really related
1) the rewards are shrinking because the btc v usd rate is increasing all the time - so really the faucets are still paying out a similar amount (in usd), but this means less satoshi for users
2) minimum withdraw limits are high (and probably going to get higher) because of the blockchain transaction fees problems - it costs faucet owners a lot in tx fees so they would rather send out less, larger payments than lots of small payments.