I agree with @Kai Van Leuven , make it a personal conversation and don't be a sales man.
I don't buy so many properties, but I've been able to buy most of the ones where I contacted the owner. I knock on the door and fly by the seat of my pants wherever the conversation goes. I don't try to do a hard sale. I tell them why I noticed the property and what I can envision for it and ask them what their plan is.
I'm also on the receiving end of an average of 10 calls, texts, postcards a day. I still own 13 properties in a gentrifying neighborhood. I'm a total b*tch and tell most of them to 'go to h*ll'. Yes, I'm an investor and should understand their side and should have the patience, but it's clear that to almost all of these investors I'm just a number and I don't react well to that.
They all say and write the same thing. Every freaking one says something like :"I know this call comes completely out of the blue..." or "I know this is completely unexpected"or "I know this is surprising.." They all start off the same....must have all taken the same course and I tell them that it's not out of the blue at all, since I had 3 or 4 calls saying the same thing in the past hour. It's an insult to my intelligence, when they print these postcards with "...street" printed in a different color or font, showing that they have this blank formula and just instruct the computer to fill in that address. But I were to call them back, my name would not mean anything to them.
I think that's the crux of a lot of things in this world: gangs, school shootings etc: ......people want to matter. Nobody likes to be treated like they're a nobody and the person on the other end of the call will just say 'next', when you hang up. And that's what you're telling the other person with those mass emailers or phone calls.
Knocking on someone's door takes a lot more effort and it shows some investment of time. That's why those who do it have better results. And that's why most investors don't want to do it. They just want to get the numbers in: I can print and mail 500 cards in a day or I can knock on 10 doors - so, the go for the 500 contacts. Quantity over quality.
Every once in a while some investor gets past my defenses and gets me to talk. I can tell that they're more experienced and aren't reading from some print-out. They ask questions and I give them honest answers. I tell them why I'm not selling the burn-out (because it's part of an assemblage and the other 6 properties next to it are part of it) or why the house next to mine will be difficult to buy, but I'd be happy, if they would (aunt died and 2 of the nephews took over and have lively drug sales out of it. No probate was ever done and all of the other cousins are ok with that, as they can also handle their prostitution business out of it. )
Let your potential seller know that this is about this house (and not just a number) and that they are the one in control and are important and listen to them. Work with them. Find out their motivation and then create a custom solution for them.
If it's their deceased mother's house and they feel they'd be a bad son for selling, suggest that they could donate for a bench in the park around the corner, that would have a plaque with the mother's name, so that all of the people that knew her can notice her generosity. Suggest to use the money for a scholarship for a student at her college.......I don't know, make it personal, make it about that house, let the seller know that they matter.