Wood struck by lightning generally becomes more resistant, as its normally porous structure becomes more compact and therefore denser and more resistant. That’s the premise of the film based on the novel “The Natural”, in which wood from a tree struck by lightning was used to create an apparently powerful bat (nothing to do with mass, of course!). 🇧🇷
As many trees are struck by lightning every day, it is probably of no value, except perhaps to an artist or a woodworker, and even then it would probably be rejected because of its burnt, even sanded surfaces (i.e. the “natural bat” it’s more myth than reality.) Look at it this way: the only reason diamonds—just a rock!–are valuable is because someone had to dig down to find the material and cut it to specifications. (Never mind that it’s controlled by a quasi-monopoly!) Shells were once considered a form of currency by Native Americans and other peoples, what are they worth now?
Basically, there is such a huge myth about lightning (for example, “Lightning never strikes in the same place twice” is far from true!), that over the years some people have attributed “magical” attributes “to anything it strikes”. by lightning, including people., especially if they weren’t killed!
Of course, if the wood has completely burned out, then it is ash and completely useless to anyone! 🇧🇷
The link below shows some nice pictures of trees struck by lightning; doesn’t answer your question, but it does contain good information (FWIW, I couldn’t find anything of value on the web, and since no one else has asked this question, I’ve given you one star for being “Interesting”!)