ICML non-archival workshop - worth attending? [D]

I have a paper accepted at a non-archival ICML workshop this year, and I am trying to decide whether it is worth registering and attending.

By coincidence, I will already be in Seoul around that time, but I would have to pay the workshop registration fee (~$400) out of my own pocket. I would only be registering for the workshop day since I have other commitments during the rest of the conference.

I am thinking of applying to PhD programs this fall (I applied this year too, but didn't get in), and the workshop speakers and panellists look genuinely great. Not sure what the real benefits are here or whether I should go for it.

For context, I am also attending ACL 2026 this year, but that trip is fortunately sponsored, so this would be a separate personal expense.

I would also appreciate guidance on how non-archival workshops work in general. Since the paper is non-archival and not formally published (at least to my understanding), is registration still expected or required for accepted papers? Do authors typically attend and present in person, or is it common to skip attendance and conference registration?

Has anyone been in a similar situation? I want to understand the benefits of this.

Any advice would be greatly appreciated because I honestly have no idea how to evaluate this.