I do this from time to time, i.e. camp out at a barnes & noble bookstore for more than 6 hours. Once I was even there around 9 hours. Don't really care for wifi but I do need the power plugs. However, if they were to remove that then I would probably just carry a portable power supply in my back pack or extra set of computer batteries. Two would suffice for me. My problem would be though if they actually kicked me out. At least I do have a backup, Borders is right next to Barnes & Nobles. Although Borders is not doing so great financially so it may not be a backup for long. I wonder if it will have a negative effect in the long run if they become hostile to people that just love to hang out there. Who knows, it may just be a necessary evil.