Let's imagine a Roman who suddenly became completely averse to slavery and decided to only use hired labour. Can you imagine what kind of a financial stress would create? That person would undoubtedly go down quite a few publicly noticeable steps on the scale of financial well-being.
All-in-all, I think that any such noble attempt would be stopped in its tracks by the person's family. Once something comes to you cheaply, who will be willing not only to abandon it, but to also convince all those that depend on him to abandon it as well?
This takes not only mercy/nobility of character/pity but also quite the strength of character to insist on such actions when your family questions why can they no longer afford the things they could have yesterday.
Unless, of course, no one depends on you. Then, everything is fair game