is making a bitcoin faucet is a good idea or bad.. need suggestion 
If u are going to use those free faucet script , may be possible u will feel they are not safe. Purchased one are restricted with encryptions. And you can't add much modules if ever required.
If you are really serious and want to start faucet business then i will suggest u , make a plan with finance management and develop a script either by yourself or with the help of coder and make 2-3 things in it like.
- Faucet
- Games
- Community Task
So that your site not just looks like a faucet but a task oriented site where users can spend time. So slowly it will give u more adverts.
Faucets usually die due to lack of fund in rotation.