Frontier Airlines EarlyReturns - Miles Question?

Just a quick question. How come at no tier level a round trip ticket is 15,000 miles but at accent/summit levels its 30,000 miles? shouldn't the higher levels use less miles to redeem or am I way off. Yes I am a total n00b to flying. I only have a piddly 4,880 miles with Frontier.

All members can redeem a standrad award for 15k. If no standard awards are available, elite members (only) can redeem any seat for 30k.

Cool, Thanks!!