A typical legal rationale for protecting the consumer is based on the notion of policing market failures and inefficiencies, such as inequalities of bargaining power between a consumer and a business.
It sounds kind of expensive when you first check out, but it's actually pretty cheap if you consider it. Take something standard like a Philly roll (nori, salmon, cream cheese, cucumber, avocado). At Maki it will cost you $6, but the roll is pretty fat and you get 10 pieces. Most sushi bars charge around $5 and give you 6-8 pieces.
Turn right onto Chestnut Street and cross the river. You will then be in West Philly. Go up Chestnut St. to 34th Street (clearly marked), and turn right onto 34th. This starts about a 2-mile portion of rolling uphill that is the most challenging part of the course and is one that you should get familiar with.