The answer is simple, you can gain financial freedom by investing your spare funds. Bitcoin isn't all about been rich but financially free. No matter how little you're earning, you can keep aside some few dollars and what better vehicle is there to put those savings into then Bitcoin? Consider Bitcoin as your sayings account where you store/save your money.
Do this constantly and consecutively and in due time you'll have save/invested a decent amount that would have given you a better return then what all banks out there would have given you. You don't have to get into Bitcoin by buying one whole Bitcoin, that's a mistake many noobs make which pushes them to buying worthless altcoins because of the ideology they can buy many and not in fractions.
What they don't understand or fail to realized is that, the fractions of Bitcoin you're buying now are special as they most likely will appreciate in value while that of the altcoins aren't certain. Majority will just die out of the market. Don't get fooled, get your hands on as many satoshi as you can and just hold.