Here's a little story of my last encounter with 'interesting' in a sales communication and how to tackle it:
I met a young lady working at a museum as a PR. She explained briefly what it is she did for the museum. In exchange, I introduced myself as a game designer and LARP (live-action role-playing) writer.
Me: "... you see, this is how any organization could benefit from the live-action role-playing."
Her: "Mhm, that's interesting."
Interesting! I knew immediately she hadn't reached the buying temperature yet.
2) I don't mind if you keep on talking
3) I have no clue what to say, though
4) I have good manners and would never actually say "That's not interesting."
5) I'm not buying this
Knowing this, I also knew what was my next step to increase her engagement: I needed to give her a good, relevant example that was connected to what she did. So I moved in and told her about a LARP that was run for kids at a museum in Norway, as presented by Martin Nielsen at EDU-LARP conference in Copenhagen, february 2015.
The museum LARP presented characters from different paintings as real-life characters, portrayed by actors. The actors would walk around the museum, meeting kids and asking them if they could help them get back into the paintings. All the kids had to do was tell the actors what painting they belonged to and by whom it was painted. So the kids were running around, gathering information, meeting other characters from paintings and eventually managed to get all the characters back to their paintings.
The young PR lady moved in closer, her eyes gained a certain glow and her jaw dropped a bit.
Her: "Wow, that's great! How long did this LARP last? How many actors did it include?"
I was in. She was connecting my example to her work environment. Now I needed to help her better understand LARP as an educational tool. I explained EDU-LARP (educational live-action role-playing) and gave a few more examples.
I could feel that I earned the opportunity to ask how we can proceed and who it is I should talk to at her museum. I made a friend. She would help me make the sale now.
To sum up:
1) explain what it is you do and where is the value in that
2) when you hear 'interesting' as a reply, don't go for closure. Interesting means 'give me a good example.'
3) give a good (relevant!) example
4) answer the questions now coming your way