As announced publicly several times already last year, AV-Comparatives provides since 2008 its services for a fee. The fee is NOT for the tests itself, but for the various services we provide (bug reports, usage of our material/logos for reprint and marketing material, getting sample lists, getting false alarms after the public tests, internal services, etc.). Vendors are not obligated to pay for the FULL-service-package, and if a vendor e.g. prefers to do not get all services, the fee is lower. All major testers get paid for the services they provide, this is a common practice. Of course, the fee has no influence at all on the results and is to cover our expenses and time involved.
For users and magazines the public results are free of charge, as long the source is given. If we have time and e.g. a magazine wants us to make an additional work/test of e.g. products that are not already tested, this costs some money which has to be covered by the magazine (only for the service provided to the magazine; the vendor of the tested product will not get any service).