I like them because when written out completely they always use the i (World War I) rather than the number from what I've seen and when abbreviated they use the Number (ww2) so they follow the common way. I'd say Low to Mid $xxx for them together for a end user.
I can't really give a value to the domains themselves but I think that if you find a buyer who is interested in making a website of memorabilia and collectibles then he will probably pay a decent amount OR you could develop the website and sell it.