I've made my faucet with totally 0 cost, the host and domain are free and i got them from Hostinge and i installed faucetbox free script so i made my own faucet with no cost and that's very perfect for me, but i still confused about choosing the best ads network.
Free hosting generally have bad uptime and low bandwidth. If there are many visitors, the amount of bandwidth is going to be very high and the uptime would be unstable. This would limit your earnings significantly.