I understand that I don't have the same insight into your customers as you do, but to give a counterpoint, I charge significantly higher than $5k for my service

I understand that I don't have the same insight into your customers as you do, but to give a counterpoint, I charge significantly higher than $5k for my services and my customers don't receive any tangible improvement to their revenue as a result. I have not found that they are incredulous about my rates, let alone due to pride. Maybe there's something other than pride at play here, such as market dynamics or your product? Your customers' pride could be one reason why they refuse to spend that, but have you considered that this is an uncharitable perspective? Don't you think it could also be because they have honest reservations about your product or better alternatives for their business than that they are obstinately refusing to just hand over their money to make $50k? I think it's much more likely that the situation is actually quite nuanced with competing incentives, priorities and perspectives on either side. An information asymmetry is not the same thing as irrationality.