While I think eBay is too risky for something like a MacBook, there are steps you can take to maximize the amount of protection. It's far from 100% bulletproof, but here are a few things I would recommend, many of them require going into your eBay dashboard and editing account settings:
1) Set up your sale in the Buy It Now format rather than auction, making sure to check the box to require immediate payment. This will weed out anyone who buys with no intention of paying. Plus it saves you from having to file any unpaid item disputes, then having the buyer pay and leave you bad feedback out of retaliation.
2) Set up your buyer blocks. The main ones are filtering out anyone who has 2 unpaid item strikes over a period of 12 months, blocking sales to countries you're not willing to ship to, and those who don't have a PayPal account.
3) Regarding international sales - way too risky for a MacBook or other Apple hardware. You would need to set up international shipping blocks separately. Check the box to block absolutely everywhere, including North America, as that setting is for Canada and Mexico. I would also filter out Alaska, Hawaii, Puerto Rico, APO/FPO, and US protectorates, as it's not cost effective to use UPS or FedEx to those locations. Speaking of which...
4) Use UPS or FedEx to ship rather than the USPS. This is more personal opinion, but I don't trust the post office with high dollar value items. Whatever you do, for selling an item greater than $250, you must purchase signature confirmation that's viewable online. This way, in the event the buyer files an item not received claim, you will be protected. Should you decide to use USPS, the insurance form you fill out that makes the buyer sign for the package does not count as online viewable. You must purchase the separate Signature Confirmation service.
I think that covers the basics. Again, it's not 100% protection, but you'll at least be better prepared than a lot of other sellers.
The only real concern that you can't do anything about is your own feedback. If you have none or a low figure, you might as well paint a target on your back as those are the kinds of sellers scammers are looking for.
Good luck with whatever you decide to do.
Personally, I've been on eBay since 1999, and it's a vastly different place than it was even 5 years ago. I've pretty much abandoned selling on there, though I've been finding myself buying a lot of stuff lately.