You don't need to invest faucet if you want to earn. With just some effort, you can get it for free.
For Bitcoin Faucet
https://nioctib.coFor Ethereum Faucet
https://muerehte.coClaim every 15 mins with 15% referral
I agree with you,you don't need to invest in to a faucet to earn from it.If you want to earn from a faucet,find a new instantly paying faucet like
http://free-liteco.in or similar and get as many referrals as you can,you will earn yourself a passive income from your refs earnings,25% referral commissions is what this site is giving,which is good.