[Someone1234]

I think people should research a company before working for them, and I'd definitely download the app and act like a consumer to get a feel for how the product works. I wouldn't set up a fake vendor however simply because that seems disruptive to the app's ecosystem and is likely researching a little too deep into what appears to be a basic shopping app.

Honestly if I emailed about a job and they wanted me to set up a "vendor" account, I'd just assume the job was fictional and this was a roundabout way of advertising their app.

> For the fairness of the discussion, the app itself is solid with decent UI and UX.

That's a strange line. Typically when expressions like "for the fairness of the discussion" are used you say something self-reflective to ward off "obvious" criticisms. The way you're using it here is like "For the fairness of the discussion, I am awesome!" Just a really strange turn of phase, not sure what you're trying to convey with that.

> So did I ask too much? Or I expect too much?

You expect them to care as much as you do. That won't happen. They have no vested interest in it.

Bring them in, talk through the app, find out their thoughts/ideas/problems and see who you like.