Adding an IEC for an older product does not lower the resale value of electronics.
(if it were a famous legacy product like a marantz 9, maybe?)
But any company making a current version with an IEC will not be hurt adding an IEC instead of a captive cord to an older model. (KEEP that original cord and add an IEC end to it. label it so you can sell it with the amp if you ever do sell it.
It can be VERY hard to drill/cut/smooth the chassis of nearly any electronics IF they have stuff inside that are too close to the area the IEC would be installed, as drilling or cutting into the chassis can be problematic, unless the parts inside that are too close are removed.
(this is why they cannot give an estimate.)
IF you look inside and plenty of space around where the captive cord enters, it will be cheap to fix. If the transformer or a circuit board is right up near there. ahh more money will be involved for labor. perhaps a lot more.
(if it were a famous legacy product like a marantz 9, maybe?)
But any company making a current version with an IEC will not be hurt adding an IEC instead of a captive cord to an older model. (KEEP that original cord and add an IEC end to it. label it so you can sell it with the amp if you ever do sell it.
It can be VERY hard to drill/cut/smooth the chassis of nearly any electronics IF they have stuff inside that are too close to the area the IEC would be installed, as drilling or cutting into the chassis can be problematic, unless the parts inside that are too close are removed.
(this is why they cannot give an estimate.)
IF you look inside and plenty of space around where the captive cord enters, it will be cheap to fix. If the transformer or a circuit board is right up near there. ahh more money will be involved for labor. perhaps a lot more.

