After joining the thieves guild I asked one of the members (I think vex) about why doing the extra missions were important. She told me that the ragged flagon used to be a "city undeneath a city" and told me that by doing the extra missions it might return that way some day.
I got excited by this, as I imagined the place getting nicer tables and chairs, carpets e.c.t everytime I did 3 or 4 of these extra missions, and I found that really intreasting.
But my question is to whether or not this is true or not, because I would be rather dissapoined if I did about 10 of them only to find out that the improvements only come along if you follow the main quest or something.
Cheers.

