Pretty solid concepts flying around with these sayings. But, it all refers to the social behavior and people tend to like free things, thus the expression "If it's free than is for me".
I remember a visit from an american in my country (Romania) and sincerely while I would expect him to be richer than me (of course he is) he expected for me to pay for his beer. Maybe this is the customer in America, but myself being a student without working...I found it pretty lame.
And ... the same is with software licences, being free those will be used like this forgetting giving incentives to the author. But, I appreciate the work and the bidirectional respect and recognition that needs to be in place between the author and the end user.
I think in the US, who-invites-who is used to decide who pays for beer. In most of the world, it's age/seniority (where income is the tie breaker, or something). So this creates a conflict when the person from the US invites someone to have a beer who is not from the US who is older. The person from the US tries to buy the beer and ends up offending them.
I don't have any personal-first-hand experience with that, so I could be wrong.
Good to know that about the american culture as at the moment I was a little bit puzzled about the behavior. That probably also because while indeed I have invited the student in the city, myself being so without too much money and considering the discrepancies from the 2 worlds we are living in...I thought that he would be more sharing and splitting the costs. But, at least from cultural point of view, it makes sense...and I might look at that experience through different eyes now.
wow i felt bad for leaving a rambling comment but after reading this , lol i see that you are @cryptorg are just as bad as me! I dont think anyone would be offended in these situations concerning beer seniroty purchasing protocals :D