Pros posing as hobbyists?

I have frequently noted that a seller will often use a normal reason for selling. The typical ones are Downsizing, New baby, Project never materialized.
I check to see what else they have for sale and it can be a very long list. It looks like a semi pro's used components inventory for sale.
It is no crime to sell here as a hobby just making a business on the side as it were. Why give us the silly string of excuses. I like people being very upfront it gives me a sense that the seller has integrity.
A new category without added fees perhaps would make it easy for everyone. What do you think?