Depends on your skill with restoration really. I usually set a personal limit on ebay vintage blades of $15-$20. So for me it would only be worth it if I could turn all 5 of those straights into shavers. I don't use Shavettes, so the odd one out would likely go straight to the round file. 4 of the 5 I'm confident I could get shaving, but the one with the chips in the blade looks too rough - another candidate for the round file.

Then the question becomes, is it worth the time and money spent to get those 4 blades polished and in shaving form. At the cost to acquire them (more than I personally alot myself on an ebay find to begin with) I'm going to wager you can find 4 blades in better condition and have them up and shaving in a fraction of the time with a fraction of the effort. Of the last 3 I bought, 2 were cleaned up in less than 15 minutes with some 1K sand paper and CrOx on a cloth Dremel polishing pad, then bevels set and honed up in under an hour each. 3rd one needs scales, and I just haven't felt up to hunting down the set I bought for it, filing, forming, polishing, and pinning them up.