Unfortunately, being a diecast kinda guy I can tell you that particular JL is not really a high-ticket item. With all due respect, with $5.00 postage (First Class? Priority Mail? Box? Envelope?), four days to pay (mail takes almost that long to get there), and an unknown reserve you are going to be hard-pressed to sell it. My very humble advice:
1. Start it higher with no reserve - say $1.99.
2. Keep the $5.00 shipping, but specify what that includes. Boxed Priority Mail is the standard for diecast and will cost you $3.85 anywhere in the US.
3. Give them seven days to pay. That gives them a few days of mail time and a few days to get a money order.
The bottom line on that particular car is that it might be worth $7-8 to the right collector. By the time they have paid the shipping, money order fee ($0.85), and met the reserve, it may not be worth it. Sucks, but then I know all too well about trying to sell diecast on eBay. Oh, and here is a gift from me to you:
http://tinyurl.com/u5e3
That is the address for ALL of your current auctions as you list them. Rather than link to one auction, you can post that address everywhere. I converted it to a short one so that it works in all forums and all e-mail formats (no wrapping).
Good luck!