Can I take tasters at Costco two at a time with no intention of ever buying the product?
It's up to you but why won't you buy the product?
No, I just want to spite them with my appearance
You not obligated to buy a product just because you got a free sample. But why do you aspire to be spiteful?
They are shitheads. And they look down on customers. They think they will get my money.
It's good etiquette to just take one since it is a taster at the end of the day. I don't think they care if you don't buy their product because those people are usually employees of Costco and not from the actual food company. It's better just to leave more tasters for other people in case they want to buy the product.