Trust me though - don't mistake silence for disinterest.

Silence generally implies consent. 

Your silence will give them the incentive to continue. 

It is definitely nothing out of the norm these days for agents to resort to radio-silence if the property is under contract already, don't take it personally :) If you really want to stir the pot a bit then contact the Broker directly and explain to him you'd just like some Feedback on an offer you submitted and to ensure everything is ok with the Listing Agent! 

I guess the silence says it all.

Do you hear that silence?

Keep the awkward silence so the sellers will feel the need to keep talking.

Your letter strategy might work, but I'd put money on receiving nothing but silence.

Most investors struggle in silence by never having a group of like minds to keep them on track.

This article explains why even though MERS is demonized, there are two ways to approach it and believe me it took a lot more reading mixed up with a shin-ton of thought lounging in silence on the couch.It's true that I do my best thinking about complex dry **** when I'm focused, not stressed, in silence and in the mood for it.