That's not true, it's cheaper for me to buy things on Amazon with Bitcoin via Gyft (3% cashback) than using my credit card (1% cashback) or debit card (nada).
You're ignoring the cost of acquiring bitcoins in that 3%.
Also cheaper still to buy gift cards via raise, cardpool, giftcardgranny, hundreds of other results for "discount gift cards" which are 3%-6% off AND get your 1% cash back.
Please link me to a site that has Amazon gift cards at a greater than 3% discount. I tried searching last time someone gave me that reply and couldn't find one.
Your own specious arguments also ignore the cost over exchange quoted prices in acquiring Bitcoin, and make a lot of incorrect assumptions to boot. You seem very vested in making this sound like bad news. I guess your job as a shill is in jeopardy? Better post more.