You're only going to get about 2-3k for that EIC.

Assume that you're not married and only one of you works. You're still going to pay about 20% of your earnings and maybe get back 7-12% ... Depending.

Not everyone is married. If the other person can be claimed as a dependent you still could get a credit for that. It's supposed to be about 3.5k per dependant... But that's a general estimate, it really depends on other details.