There are definitely a couple of milongas in BsAs where the organiser may be 'generous' to you with where they place you on your first visit, but if you don't dance much (if at all), that will certainly negatively influence your chances when you return. Good seats at a milonga are always at a premium. The more skilled/experienced dancers and/or the hardcore regulars will usually get the prime spots. There is a hierarchy of sorts. Fortunately though, everyone pays the same to get in (or at least no one gets charged more than the standard - some people will always get in free because...) Whereas, in other situations e.g. sports, the best seats will go to whoever pays the most, regardless of whether they have any genuine interest in the event.