Trying to get the most out of another while giving little or nothing seems like a strange and rather mercenary way to approach interpersonal interactions. Could you explain how you arrive at this mode of communication?
I know analysing social interactions is seen as a rather, if you will forgive the term, "autistic" (or worse, sociopathic) way of looking at things , but some people do not have the natural capacity for social interactions that the vast majority of the population enjoy. I myself have wondered for years if I lay on the autism spectrum before getting diagnosed with ADHD and so all this I had to learn explicitly from years of observation.
That may be your perception of autism, but this statement is more akin to using "retarded" derogatorily than actually making a comparison. Autism is categorized by deficits in social interaction and repetitive thoughts or behaviorism. "Analyzing social interactions" is certainly not a standard symptom of autism, and depending on the severity of one's social deficit it may not even be possible for someone on the spectrum to do so without the help of a therapist/doctor/behavioral aid. I discovered I was on the spectrum this year, albeit at a relatively low level, and while I personally analyze social interactions a lot due to anxiety it absolutely shouldn't be seen as "rather autistic" as you say as that is a mischaracterization of autism
You've clarified that though and it seems much more reasonable, although I'm still not sure why there must be information asymmetry. As an example, I just attended an office holiday party. Myself and a coworker I don't know well had a brief conversation on each other's family visit dynamics during the holiday season. I think we both fairly adequately covered our respective situations, and neither of us could come away thinking, "Wow, he/she knows all about my setup but I still don't know much about theirs". It was pretty equitable.