"When you're broke, the bank starts charging you money... for not having enough money. If you have a lot of money, they give you money. Because you have a lot of money! You have so much money that we should give you some! Because you have a lot, you should have more! Here, take more money! Take this guy’s $15, fuck him, you should have it!"
Like the article says, class boundaries are also knowledge boundaries. Because you don't know of any alternatives, you bank at the local BoA and get taken advantage of to the tune of $15/month in perpetuity with a low balance, or even pay a percentage at the corner check cashing place. Or you can get free banking and around 3% APY today if you have savings, know how and where to bank and how to structure a 12-month CD ladder. It's expensive to be poor!