Added some homemade tree saver straps to the inventory. Bought a 15' cam-buckle style strap that was rated at a working load of 750lbs at the local tractor supply, removed the cam buckle piece, cut the hook off the other end, and chopped it into 4 pieces of roughly equal length.
Then I used my speedy stitcher, like this one: http://www.sailrite.com/Speedy-Stitcher-Sewing-Awl-Kit
and did an X stitch to form loops. I don't suspect my wife's poor singer would like to punch through the thick webbing, much less doubled up. Plus, I use a nice waxed thread with the awl, so it ought to last a while. Note: I'm not affiliated with Sailrite, and didn't even buy my speedy stitcher there (local hardware store), but I did get more thread and some smaller needles there once. Alright folks in my book, they sell a lot of stuff that overlaps this hobby and shipped quick.
Here's what the stitching turned out like (note that I have a fair bit of experience with this sewing method, your mileage may vary..):
A couple test hangs by myself, weighing in around 170 in clothing; the webbing has very minimal stretch and the stitching showed no obvious signs of fatigue. Strap cost around $8, and I got 4 tree savers out of it. Can't complain.
Quick note: ratchet and cam buckle straps are rated for a lower working load than the webbing and hardware can actually take, due to G-forces exerted on them in a brake-stab or crash, where the weight of the strapped load can triple, so I can rest easy (literally) knowing that the webbing itself ought to take around 1200-1400lbs at least, and I'm only at the mercy of my own stitching. I've crashed pretty hard in the hammock after a long day before and haven't seen my weight triple yet!