Maybe its not so much a value added, but if and when you decide to sell, the buckets make it easier to sell because most folks perfer a bucket seat interior.
I've got both, my chevelle is a bucket/console 4 speed, the 71 elky is a bucket/console automatic. my 68 went from a bench to bucket seats. The 68 is a daily driver, we ended up putting a bench seat back into it after about 2 months.
Funny thing, I just got a smokin deal on a set of chevelle bucket seats last night. Now Im trying to convince myself, do I have them redone in cloth and try buckets again. Or just leave the bench in it and use the bucket seats for trading material. jim