The RA looked into this back in 1998 and came to the conclusion that there were no merits in applying the policy of Spectrum Pricing to aviation as they cannot sell the frequencies to anyone else!
Spectrum pricing study: Final report
Quite how they would apply this pricing is not clear as they say in the latest report that it is not a charge for individual licences.
The current report shows a fundamental lack of knowledge of what the aviation use of the frequency spectrum is all about. The quoted fee for a 25KHz spaced comm allocation is 3 times that for a 8.33 KHz spaced allocation; It appears they don't understand the difference between bandwidth and channel spacing!