In my neighborhood, (hot and humid) attic venting is now considered a bad thing. Where do you live?

Why would attic ventilation be considered a bad thing?

It does not make a lot of sense in a hot, humid climate with air conditioning. It may be true for even less specialized conditions (ie. hot not humid). This is especially true if the AC equipment is in the attic. A second big reason is that it is often a lot easer to seal at the roof line than it is to seal between the attic and the living space. (There are a lot of holes between the attic and the living space, can lights, holes for cables and pipes and poorly-sealed construction. They are there originally and people don't hesitate to add holes and not seal them. Nobody will complain if the cable installer puts a few holes between the attic and living space. Everyone will complain if the cable installer puts a hole in the roof. Read on:

http://www.buildingscience.com/documents/reports/rr-0301-unvented-roof-summary-article