A) Collectors have the potential to become an expert in one area.

>>>CORRECT

And sometimes after a while, the value of the collected items rises and benefits economically.

>>>Sometimes, over time, the value of collected items increases, providing economic benefits.

But above all, it seems to be self-satisfaction.

>>>Above all, it appears to bring personal satisfaction.

A) Both of them have something in common that they collect something.

>>>Both collectors and hoarders have in common that they gather or accumulate items.

However, the collector's motives are pure, but hoarding is not.

>>>However, collectors usually have a purposeful or pure motive, while hoarding tends to lack this.

As a result, collectors do not harm others, but hoarders damages others.

>>>As a result, collectors typically do not harm others, while hoarders can cause harm to themselves or others.