Without the tents and popup villages of the larger occupy movements, there are a regular few that spend a couple of hours one night a week every few weeks apart.
In general I would find it hard to believe that any great portion of the 99% is near the poverty line in the US. In fact I believe a great portion of those in the 99% are in the top 3% in the world. If you own your own home and have at least a minimum wage job, you are in the top 3% of wealth in the world*, not the bottom 99%.
Yes, there are changes needed, but unless you are struggling to keep your home or feed your family, I do not feel that holding a sign is the best way to bring change.
*Statistic I came across about 10 years ago, unable to verify with a source or more recent information.