General manager John Lynch has heard the complaints, and he appreciates the passion, if not the business sense, of the 49ers’ fan base.

How can the 49ers, who have been active participants in looking for upgrades at past NFL trade deadlines, sit on their hands instead of upgrading areas of need, such as adding to the pass rush?

Lynch is for the most part off limits during the regular season in terms of media access, except for his weekly appearance on KNBR-680, the 49ers’ flagship radio station. He explained on air Thursday morning why things were so quiet at the deadline as the 49ers made no late moves to add to their roster with a 6-3 record but some obvious needs.

“We weren’t going to get fleeced,” Lynch said. “We weren’t going to overpay. It’s just not good business. And as they say

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