Intel core 2 Duo E6600 is processor released in 2006 , and intel i5 in 2009.How can those be great processors and basis of great computers now in 2019?You can basically buy new processor for 60-70 USD that is better than that, like Intel Pentium G series that is very good value for money.
WoW Classic is actually not demanding at all, and it is less demanding than retail WoW.
I have know for quite a while about people running private servers without the patches or up to certain patch, due to lack of time i didn't delve deeper but i cannot imagine what "classic" would mean at this point. I don't think asking money for this is a good idea, unless its a sanctioned official thing, but i rather play something else at this point.