WiFi - one computer at a time - common?

I would assume the one computer one code rule is in place for one of three reasons. 1. the park has problems with people in the surrounding area logging onto their system and dragging down performance. In this case, giving out additional codes to guests wouldn't be a problem. 2. It is a pay for usage system, where giving out unlimited codes would defeat the purpose. 3. The system has bandwidth issues (usually in rural areas where broadband is limited), and they are trying to keep down the number of users hence making the system work for all the guests. Signing a router into this situation to allow multiple connections defeats the purpose and really imposes on all the other users. Best to find out the reason before making judgements.