I send follow up emails as well. Seems if you use certain wording though they dont go to the buyer. I have had many after a couple more emails from me they say " I never got anything"
As for the notes on there that the OP was talking about. Yeah you can put a note on there for them to read but these are "buyers" that we are talking about.
I know I can send messages, but ebay gives me a message saying that you have the maximum number of messages per day and I have only sent like 2 messages. This is for accounts with less than 5 feedback. That is why I asked about the notes. I doubt they read notes. All they care is about the price and listing features. I hope these buyers read the f note!