Fingerprints are not easily removed unless they're removed within next few min. Than they stick there like a glue and one have to literally rinse to remove it. It also depends on skin and every skin is different. One is more moist another is more dry. There are fingerprints that needle can acctually feel and give a surface noise like ones from the burger grease for instance. VPI would not rinse these off and they'll still be noisy. After ultrasonic cleaning they're back in business sounding very clean. After handling hundreds of thousands of records you will definitely know what is noisy and what is not.
This costly idea can be sufficient by spending $10 for 2 dozen of cotton gloves worn normally by restaurant servers.
There are many confident record listeners who know how to handle them and there are young college kids that do not know and would actually actually ask for gloves if available believe it or not. I have visitors of ALL age categories down to high-school kids shopping for records.
Once again -- the gloves are provided for customer convinience, not for mandatory use
