After having read @Kargai's idea, I thought of a loyalty based faucet, like if you claim over 10 times a day your faucet, it increases by 1%, until day 100 where it finishes increasing and you have a 100% bonus on your faucet. If one day you don't claim it 10 times, or don't get to primedice, it resets the bonus down to 0% again. Also the claiming faucet limit is a great thing to avoid people doing that faucet farming thing. Maybe include a little jackpot once a week with a certain amount, and let someone win it while he claims his faucet? Dunno I guess it can make more people wanna get on primedice
Also, maybe making more happy hours, where we can claim a 10k faucet every 10 minutes or something?
About the captcha. Well I guess the best thing to do is to make a mini game like connecting dots with the same colors, or dragging droping an image into a frame. I don't know that much about that but let's do something funnier!