Comment by davnicwil

I just think they genuinely don't know. I was years into travelling before I learned about this 'trick'.

For my part, I'd just always assumed the charge would be ultimately converted by my bank in any case. Seems obvious now I look back, but I honestly just didn't think about the trick.

Just as an example that gives evidence for this, sometimes you'll go to the same place multiple times and the norm is they ask but occasionally someone won't. So it's not a policy.

I presume the people who don't just don't know about it, don't want to bother me and aren't aware it will make a difference.