Dado Vucak yeah, that kind of IF/THEN approach could work too. I honestly don't think it makes a huge difference either way (we're talking about just a few words within the overall message of the letter), but I don't think it would hurt anything to do what you're suggesting either.
I did do a couple of postcard campaigns earlier this year when I was going after some larger acreage properties in my home state... the kind of thing that I wasn't confident about sending blind offers to. It wasn't a huge volume of mail because I was targeting a very specific property type in two counties. I think it was less than 500 units total. I didn't get a huge response from them, but I think the lower response had more to do with the recipients on my list than on the postcard itself (sending mail to the right people is always the biggest determining factor of how good the response rate is). It was an experimental thing that I probably won't try again, at least, not in the same manner I did.