[vinibrito]

I have done it, it increased my business volume and when I stopped it decreased my business volume.

I stopped because I wanted to focus on recurring services and filled my schedule with these.

Most challenges with productified services come from risk management. The more bespoke the work is, the more risk you have, and the more risk you have the more risk mitigation tactics you must apply.

I suggest that you read a lot on preventing scope screep and managing time estimates before diving in. Jonathan Stark is a good start on that, he has free and paid materials available.