Is "I will not be providing a tracking number, please purchase this item at your own discretion!" Sufficient protection against lost items?

[lifeisnbd]

Tracking numbers are very expensive and if included in the price will destroy my competitiveness on eBay. What can I do to protect myself against lost items during shipping? What messages or proofs can I provide?

[lotzofuniquegoodies]

@donkeykongvsbowser_7 

Unfortunately the default in search is best match vs most recent. Causes minor confusion on a REGULAR basis.  ZOMBIE discussion monitor should be here shortly to