Right now I make 100 Doge coins a day from my referrals on the faucets I use.
How long does it take to make 100 Doge with a miner?
Should I keep investing in referrals or start mining, that's the thoughts.
You can look up pricing of asics in your area, check the electricity costs etc then input your data into something like whattomine and see how much you will be earning with current difficulty and price.
As for what you should be doing, faucets don't really have a what you would say sustainable business model, so they are going to go belly up eventually. As for investing in dogecoin miner... I guess if you believe in it...
My humble opinion:
Dogecoin is a shitcoin that is currently being pumped and I would avoid any long term investments in it.