Could almost make a case for a "tragedy of the commons" situation here. Common resources of seats and wifi. Most people treat them reasonably using the seats for social interaction and the internet for meeting resources perhaps, but some people having no reason not to leech onto it and over use it then causing the aforementioned problems ruining it forever one with blanket bans and plug power slots.

As per usual moderation is probably the key. Around here lots of places give out wifi for 2 hour per drink. At least they keep you buying if you are going to sit and take up space and wifi. Seemed pretty fair to me. Most casual cases and meetings are well with in 2 hours so more cases are covered and the hobos get the boot or are forced to pay.