If product companies are smart, they might put this role under costs to acquire customer vs services and then have it as a fee for onboarding. I can’t remember the details, but I’ve been told having really profitable services can really complicate VC/fundraising.
Regarding your second paragraph, investors looking for the the YC startup definition don't like services companies because they couldn't scale at the pace of product companies but they are specific investors oriented to these companies because they have a more secured cashflow.
BTW, some people like Michael Cusumano [1] argued about hybrid companies to better handling economic cycles.
[1] https://mitsloan.mit.edu/faculty/directory/michael-a-cusuman...
Basically the argument is that there are business cycles when companies are spending more money on products and less on services and in some crisis with services you can compensate that. There is no general advice for all companies.
It was more to clarify it was proserv work than anything.
In the context of SaaS/tech, typically professional services is implementation, maintenance or break/fix of specific products or technology. Advisory work is supposed to be independent work where you are being paid for (what is supposed to be) unbiased opinions and strategy.
It's the difference between staff augmentation / project work and strategic / planning work.