Personally, I am undecided. It is something that happens so rarely that removing it will not modify significantly the gameplay, in my opinion. I also agree that most of the times nobles do not recognize the claims obtained through corruption. On the other hand, however, in more than one case there have been situation where buying a region led to very interesting consequences that would be a pity to lose. Also, as vonGenf said, it really gives some more sense to hoarding family gold.
In conclusion, if deleting it helps the devs with the coding, then it is not a big deal losing it. If the reasons for removing it are mainly tied to gameplay reasons, I think it could be kept.