Absolutely. If a thread hits a large number of pages and doesn't have a recap, either in the beginning or the end, if I haven't been in it since the beginning, I don't like trying to figure out what's been claimed and what hasn't been, so I sometimes will avoid them altogether.
FWIW, for all of my large threads, I try to put a recap at my stopping point (with everything sold marked as such) and a link to it on the first page (and in the subject title). It's more work, but the more buyer-friendly the thread is, the more likely you're going to have success as a seller.
Same for me with no recap, I don't bother going through it all to figure out what's available. Rarely worth the trouble.