You are responding to somebody who claims to have a receipt with a "I think". The best way to respond to an anecdote is data, not opinion.

I'm the kind of person that keeps receipts for tax purposes, as all parts I buy are for business purposes (repairs, fresh builds, etc.)

Umm, would you care to point out where in my unedited post I said "I think"?

I did mention the DRAMeXchange source though.