A group of people are gathered on a sidewalk in front of a store nearby a littered street.
A group of people are considering whether to shop at the store.
Just because a group of people are in front of a store does not mean they are considering to shop there.  They could be doing something else.
Just because a group of people are in front of a store does not mean they are considering whether to shop there.
People can gather in front of a store without considering whether to shop.