while the value of the bitcoin payouts you can receive right now from signature campaigns might be quite low(in USD value), if you hold it long enough, it might be worth a lot more in the future.
Unfortunately, most newbies don't think like this. They are here only for some quick and easy money, which is why many of them fall victim to blatant scams or will advertise any old trash in their signature and be paid in worthless altcoins. It's also why many are so desperate to sign up for a campaign immediately instead of just spending some time reading and learning.
Faucets used to give out 5 BTC for free. Patience is a virtue.