I don't think the amount of money one spends has much, if anything, to do with one being an "audiophile".
It is more about the passion that one has to experience music in its purest form. To bathe in its beauty and emotion whether you are listening to a $1K system or a $1M system.
Take a look at the contributors on this site and you'll find a very wide range of income levels, but they are all certified audiophiles.