1) You’re broke and have hit 30 years old. You can no longer buy the Rolling Venice Card (currently costs only 4 euros in 2012), which gives substantial discounts for sights, transport, and shopping (valid for the whole calendar year) in Venice.
2) You’re allergic to pigeons. Unless you don’t intend to step into St Mark’s Square. In which case, why are you going to Venice in the first place?
3) You hate walking in crowded, narrow alleyways. I’m talking about the major walkways here.
4) You want to keep believing that all roads lead to Rome. In Venice, many lead to dead ends.
5) You dislike pizza, gelato, pastries, pasta, and seafood.
6) You can’t stop once you start drinking Prosecco, the *much* cheaper cousin of Champagne.
7) You have just got out of prison and will go into hysterics when you see a jailbird in every gondola.
8) You make it a point to visit all the historical churches in the city you travel to. According to one source, Venice has 149 churches.
9) You prefer to wait till there’s no restoration works ongoing at the key sights.
10) You only want to see the “local” way of life. Unfortunately, Venice is all about Tourism.