I wouldn't say perfectionism and sales-orientedness are on the same dimension. However, I have noticed that being given the hard-sell is more often than not associated with the product being sub par. A product or project that is doing very good work often doesn't have to sell quite as hard, because the work speaks for itself. (My experience on this issue mostly deals with internal teams. I don't know how much this applies to external teams.)
This is especially true when two products have teams of about equal size, experience, and expertise. Time spent selling is time not spent making a better product. All other things being equal, every hour spent selling is one less hour spent working on making your product better.
This is especially true when two products have teams of about equal size, experience, and expertise. Time spent selling is time not spent making a better product. All other things being equal, every hour spent selling is one less hour spent working on making your product better.