22. Roof vent

I'm at the point where I have to decide whether to install the roof vent fan or not. I may leave it off of the Charlie Model if I can get opening door windows because I like the clean look without the vent fan assembly. Also, it would be one less thing to leak. On the other hand, more ventilation might be a good thing after an evening of dutch oven chili, beans and beer. What do you think?