While it's against the django mindset, I have done a few copy-pastes in my time using this framework.
Recently I've been doing some copy-pasting of some modules and found that often I was getting blank lines when retrieving variables.
The problem was that my text editor was fudging with the tab order of some of the lines-- a huge problem in python-based programs. My Meta class was tabbed forward so it was part of the method, not the class. By de-tabbing it, I was able to see my variables as expected.
Sometimes it's the small things.
If such a scenario exists, a better idea that goes along with the DRY principle would be to create one base Form class with the Meta class and have all other classes inherit it appropriately.