It seems to me that it is not very profitable right now. Bitcoin price is very high and few advertisers will agree to pay in that currency. Besides, now a lot of these sites, and a lot of competition. There is no guarantee that you will have visitors
There are other things to make an opportunity to have a bitcoin and with the high price like this, people will surely ignore those micro earnings in faucets and began studying those methods that can give them a good return of bitcoin that will be worth their time.
Only faucets that is running and operating for a long time now is the one who are making good money today since they already established a good name in the world of bitcoin faucet.