I see why you do, but that's such a shame. DKI a damn useful feature that could help both customers and businesses, but it's 'exploited' in a way that doesn't even help the people who are destroying it.
When used appropriately by the business it could alert the consumer of a relevant product/service and hopefully a special deal. This helps the consumer easily find the product/service and possibly save money. It also helps the business nab a sale they weren't necessarily organically ranking well for.