Well you just shot yourself in the foot with that one. Premiums that purchase all content pay more than VIPs that only pay for the sub which will have to be active for anywhere between 1.5 years and 2.5 years. a little outdated but gives the jist off it:
"As you can see from the Grand Total charts if you’re happy with slots 1-4 you’ll be looking at a total of $218.32, which is about equivalent to 1.5 years of VIP subscription. And if you want slots 5-10 you are looking at a total of $320.02, or 2.2 years of VIP subscription."
cited from this web page:
http://furlugedepot.com/2009/09/15/t...-free-to-play/
This is not taking into account the premiums also buy xp pots, cakes, armor, hair dye, and etc.
This just takes into account the bare minimums alone. So therefore, they should get more than your VIP sub gets you.
You are right, they should.