I try to keep straight edges out of my main collection but I don't avoid them completely. When given the choice, I prefer a stamp that is well centered with nice margins even if one side has a straight edge, instead of the same stamp that is off center with narrow margins or perfs close to the design. I have some off-center stamps in my collection that stick out like a sore thumb and I want to replace, and others with a straight edge that I am quite happy with. It is all about the aesthetics and personal taste.
When comparing two stamps side by side, the one with the straight edge is usually less desirable but not always. It is just one factor that affects the price, but not by a specific amount. It is a sliding scale. I would also prefer a well-balanced nice-looking stamp with a straight edge over one with a bad reperfing. The straight edge is a natural phenomenon, the reperfed stamp has been tampered with.
But that's just me. I am one of those rare collectors who also collects matched sets of all the positions of straight edges. 51studebaker, what is the name of that catalog or price list that you pictured? $15 for a 293. Nice!