Seems to be part and parcel of (some parts of) the human experience. There are always going to be people who try to "smarm" their way to free services.

Naturally, boundaries are essential in something like a therapist/client relationships... but I even see it other aspects of the world. For example, I am somewhat of an expert in a specfic type of collectible and I sell on eBay... and I frequently get random messages from people who who have no interest in buying anything, they just want a free expert opinion.