[chrisseaton]

To be honest if anyone outside of my work showed me their product idea I'd at least pretend to be 'excited' about it just to be polite.

[kbos87]

In retrospect I’ve semi-unknowingly done this, and I regret it.

The parent comment is right. There are two useful outcomes - they are willing to take their credit card out, or they are willing to give you direct feedback. Everything else is noise.