Let's try and figure out how much wow has actually cost you. Can you figure it out? or give a rough estimate? Are you brave enough?
Game purchase + expansions + game time + character services + game shop
How many cups of coffee is that?
What about time spent? That's also a cost factor right?
Then throw in exams, opportuniteis, jobs, relationships, trips, vacations, family members etc
Have I missed any other cost factors?
-- EDIT ADD (from reply 17)---
there is also the time cost of doing wow related content:
1. Reading and posting on fan sites like MMO-champion, wow reddit, wowhead, ice-veins etc etc
2. Trips to conventions like Blizzcon
3. Youtube & Twitch following videos and streams
4. The amount of people you had to be rude too because they were interrupting you during the raid , arena, or dungeon (esp M+) you were running - then what that cost you with them.
Was wow the primary reason you upgraded your PC? Be honest!! Especially if the old one would have done for all the other purposes you were using it for. If so, then you can add the entire cost of the PC or any upgrade you made.