This thread confuses me. Why is a "Purchase History" feature ... something other games and a lot of online stores provide pretty easily ... the focal point for such a heated debate?
It's just a purchase history. A list of what you already bought. It's a common feature. And certainly not indicative of anything other than what you yourself choose to spend your money on. It can help with better organizing your records and/or receipts. That's it. Everything else ... which comprises the bulk of this thread's debate ... is just ancillary.
Seeing what you've spent and what you've spent it on won't change the history. It'll just let you organize your records better.