Survivals overworld is 25k x 25k which is about 625,000,000 blocks, its $28.80 for 10,000 claim blocks. 625,000,000 divided by 10,000 is 65,000. If you take 65,000 and times it by $28.80 you get $1,800,000. Hypothetically if someone spent $1,800,000 they could claim the whole survival overworld...