I agree, the reminder email - comming as a "new" offer is quite annoying. Ive fallen victim to that several times - but now I know, Oh yah, its been about 5 days since I last heard from them. Oh well, you learn to ignore them and expect them.
The reason I dont post a price on many of my domain names, is because I dont want to limit myself in negotiations. If I start off at 5,000 but someone is willing to offer 8,000 (if I had no price point) I would be costing myself 3K - always let the buyer bring the first offer!