If you have a power amp that needs considerable current to do its job, the power cord should be of a decent quality to match- IMHO $500-$1K is enough money to do the job properly. As for source components, with the exception of tube preamps and/or other pieces using a bit more than the usual amount of current, the cord should be well made, especially the terminations. Flexibility is a big plus when trying to hook up everything behind a rack system or cabinet.
In regards to extremely expensive power cords, if there is something else i need to know about (of a scientific nature), i would like to be educated further so i "can get excited" over them as well.
In regards to extremely expensive power cords, if there is something else i need to know about (of a scientific nature), i would like to be educated further so i "can get excited" over them as well.