Some planes and paints require higher ranks.
I am top 100 in original DF but in elite I am not high enough rank for many of the paints....even though I've already paid for them. If you were rank 20 in original and your elite rank is half, you would be rank 10 which does not have access to all planes....even if you already have paid for them in the original.
Don't worry. I don't think you'll have to pay again. Leveling up is pretty quick in those levels.
After being here more than 3 years I like having something new to work toward.