It’s possible, there are 2 possibilities.

Either he only operates the store for fun, and barely breaks even. (and may be possible, he seems really interested in what he does)

But even then, he may operate the store for fun and launder money for some mafia

Or it’s shady stuff period.

In the end, innocent until guilty.

Edit2: and maybe he’s just rich from his family and just does what he likes.