Handling the merchandise?

When shopping for a Vape, or other smoking gear for that matter, can I expect to have my shop salesperson open packaging for closer examination of a product?

Vapes can get expensive and I'm reluctant to lay out my hard earned cash for an item BEFORE I have actually laid my grubby hands on it. Some shops are pretty cool with demonstrating gear but others are reluctant to open packages until you are committed to the purchase because the item becomes more difficult to sell with an open package, I get that.

Am I in the wrong for wanting to fiddle with an item and not base a purchase on a picture?