The way that you know that you're making a social impact or benefiting society then you're making money. Social benefit and making profits are the same thing. There are exceptions of course, like if you made money by cheating via violence or because you got the government to grant you special privileges. Otherwise, if you're playing by the rules then your profit is the only objective, rational way to reason about you…
What do you think about tobacco companies? Or payday lenders? I understand some would do something highly profitable but morally questionable and then donate the profits to a more socially productive firm. Is that what you are thinking? The end justifies the means?
Not 100% familiar with payday lenders, but I'm assuming short term, very high interest rate loans. In principle access to credit is useful to people to meet immediate needs. It is the case for any loan that saving up, rather than spending now and incurring the cost of interest would be cheaper. Lending people money lets them enjoy houses, cars, or other trinkets earlier than they could otherwise obtain them. The added benefit comes at the cost of paying interest. If someone does that over shorter timeframes at higher interest doesn't change the value that lending brings.
What we can say rationally about the above is that consumers chose to indulge in the above services, that they gave up their valuable cash in exchange for the benefits that the above services brought them.