Unlike graphite rods, a lot more can be done with bamboo in regard to repairs. If a bamboo rod has a bend, or set, in any of the rod sections this can (most of the time) be taken out & the rod made straight again - or at least straighter than it was if not perfectly straight. Stripping & re-finishing a rod with new coats of varnish on a bamboo rod can have better results, too. That's because bamboo is a lot harder material that graphite. You can use sand papers, etc on the bamboo rod shafts more than you can on graphite. With graphite rods, any heavy sanding will remove too much material & drastically change the action & feel of the rod (& not in a good way). This is why if you change the locations of line guides, for example, there will be slight ghosting (or discoloration) where the old guide wraps were on graphite rods, but not on bamboo. On bamboo rods you can do a lot more sanding before you start damaging the rod.
The repairs to bamboo rods are usually a lot more expensive than on graphite rods for at least a couple of reasons. First, a high end bamboo rod is going to have more expensive components on the rod. In some cases, certain parts will be hard, if not impossible, to replace. There just aren't that many unused, original Divine or F.E. Thomas reel seats out there. Also, the actual repairs to the bamboo & the rod components is more labor intensive than the majority of graphite rod repairs. De-laminated rod sections (where the strips of bamboo have come apart) can be fixed, but it takes a lot of time & careful work. New, short sections of rod can be made & spliced into the rod, but again you're talking a lot of labor intensive & detailed work. In fact entire rod sections can be made new to match the rod, but special attention has to be made to get the color of the bamboo to match & the taper must be recreated correctly. You can see where this can get expensive.
With that in mind, it just doesn't make economic sense to restore some bamboo rods. If the value of the rod is less than the cost of the restoration, than it's just not worth it. That means many production rods with bad damage should be laid to rest. The only exception to this would be if a rod of lesser collector value has sentimental value to you. In this case, it may be worth it to restore a rod that means so much to you. Otherwise you're probably better off putting your money towards a new rod.