Not too sure if that's a strange comparison or attempted advertising however I think the gist really is aimed at PayPal and their policies regarding the refund/sales of services rather than that of tangible property in respects to the hosting industry.

The common sense reason for this would be that of tractability, if you where to consider the writing of an article as an example service or logo design as these things can easily be passed off as anothers work. However on the most part hosts that offer money back guarantees mostly value their promise although there are a handful that don't despite not being obligated to offer such guarantees.

That being said there in most cases are terms attached to those that provide such guarantees although despite this most companies will issue "goodwill" refunds in the most part for those clients that may not be within said terms dependant on their interacting with the company when requesting the refund and the dialogue involved.

Ultimately it depends on the provider, the length of their trading life and their respect and sense of responsibility for their customers, the best way to avoid being bitten is to choose providers carefully.