Faucet rotator runs into same thing as referrals, there is many others why should people use yours? You really can't promise better faucets then other one... so it's going to be hard most likely already loyalty to the ones people already use.
And really a rotator is a fancy way to try to get referral's, some don't realize that the rotator is using only faucets they have referrals to.I see this just as hard to get as referrals. You need some factor other rorators do not have.... and I don't see a big one just waiting there for someone to profit off of.
Yes, there's tons of rotators already. But the thing is, it's all about promoting yours with some advantage over others' rotators like putting a reward system or by updating you rotator daily. Also put a label which one is the latest faucet and which one is the oldest faucet. You can also try to make a feature that let's you sort according to how much satoshi you'll earn per claim. Probably let the users pick if they are using FaucetBox, or Xapo, etc. Try to be more creative about your site, make it look more professional but would still not take a lot of time to load.