I decided to create my own hammocks so I could totally overbuild everything. I currently weigh 370 lbs, and for my recent bike trip, I wanted to be ready to hang from a wide variety of locations, so I built a suspension that would work for trees that were as much as 30' apart (meaning low angles on the suspension==>very high stress on the lines). So I went with a double-wall hammock, Amsteel 7/64 for the ridgeline, and doubled or tripled Amsteel up to the tree straps.
I used mostly "seconds" fabric from DIY Gear Supply, and I've been very happy with the results. The occasional off-color thread or the messed-up camo print just add to the beauty of the final product in my opinion. I used aluminum nails (rain gutter nails) for tarp stakes, and I bought my cord by the spool. My webbing and carabiners were from other projects; I made some of my own hooks etc. out of aluminum left over from other projects, using drills, saws, and grinders from other projects. I'd say that up to this point, I haven't saved a dime, but I have a lot of fabric and cord left over for more projects.
My immediate payoff was making stuff I couldn't easily buy. To do this, I spent lots of hours learning to sew again (hadn't done much in 15 years), learning to clean and oil the sewing machine, making a parabola for cat cuts on the tarps, muttering curses I don't want the kids (or even the pets) to hear when I had to rip out yards of a flat-felled seam that was also sewn into the middle of a tarp panel, learning to bury splices and make soft shackles, etc. If all this sounds like a good time, then DIY is for you.