Pain point: Hand writing notes sucks - especially if you have bad hand writing. But hand written notes are powerful. And leave an impression.
Solution: Email note@scendr.com with note. Include address of recipient. We write it on a plane card with gender neutral hand writing. Stamp it. Send it.
What would you pay for this? http://www.scendr.com
It's disingenuous and I'd have to fend off questions like the above. So I wouldn't buy it for any price.
That said, I'm one person and that's simply one person's opinion. It doesn't invalidate your idea so don't take this the wrong way (as an insult or personal attack). It's a fun idea, but not one I can see anyone who is "serious about business" using.
I would never send a note to my grandmother trying to deceive her. Nor will I send these to my family.
But... If I interview with a dozen people over a weekend. I might come out of each interview, and bang out a thank you note on the spot - while the conversation is fresh in my mind.
Or... If I meet with a dozen people at a company I'm selling my product to, I might follow up with individual notes thanking them for their time.
This will never replace the thank you notes you already send - it will simply enable you to send more thank you notes to people who are still deserving.
Again. thanks for the feedback.