Honestly, its quite a rare thing to end up getting some tiny amount from the faucet and then end up with a big enough profit that you could withdraw. It is not impossible but it is as unlikely as anything could get. I would advice people to learn how to gamble, try out the demo one, and then just deposit real cash and gamble, that's the path that a newbie should take. There are too many very easy games here, not easy to make a profit but easy to understand how it works and that means you would be starting to gamble without getting into anything too complicated and could have some fun for yourself easily.
Its rare and some site will not allow you to get that money without even depositing money. Profit from faucet usually being questioned by the site. Demo option should be more ok to try the site, and if it works well for you then you can start depositing some funds. Some games didnt require a demo option because its easy to understand, and many gamblers didnt even try this option at first, they tend to gamble right away.
Yes, you are right about that, what happens is that there are some players who really like the fact of having a good tap to use them at any time and thus accumulate to see if through the money they get from the tap some day it grows and can be withdrawn, something like what Freebitco.in continues to do, which is a site that does not pose problems for doing that, so in that sense here it may cause confusion, some players go for the tap to extract money and others go to the tap to get something and play, others just use the demo mode to play and see if they like the experience to deposit, I think things have been changing a lot.