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gbj_tester-
Worth it because fun.
If saving the cost of three EW-SD50s and a B junction, and it takes less than say, two to four hours (depending how you price your time), the fun is pure bonus.
Like I say, if you're the type who hangs onto old USB cables for the wire, why would you pay for such spendy stuff as Di2 cables?
Kimmo
Pretty sure the number of folks who'd contemplate rolling their own loom, who don't already have the necessary kit, would be damn close to zero. Dropping a grand and a half on derailers, shifters and an A junction and battery left me rather reluctant to blow any more dough; in my case DIY was totally worth the time, and it was also fun.
In addition to tinkering tightarses, full-on gram-chasing weight weenies might also be tempted, given it's a tad lighter.
And it's a bike, not a 20t hydraulic hammer. Your soldering skills must blow chunks if you'd be worried about vibration.
Speaking of, my loom is made from single-insulated wires (probably Teflon, judging from how annoying it was to strip) harvested from better-quality USB cables, plaited with fuzzy twine, and that trick has been successful in preventing any buzzing or rattles.