Well I was looking at the shop (https://sneyersul.eu/shop.php) and I found an item I never knew about, it is titled "Expand World Border" I just want clarification on what exactly this is, my guess is that my person would be allowed to go beyond plot (100;100).

Clicking the item gives you a more detailed description of what it entails.

This package will immediately expand the survival world (both overworld and nether) border radius by 1000 blocks for all players.

This package will immediately expand the survival world (both overworld and nether) border radius by 1000 blocks for all players.

will immediately expand the survival world (both overworld and nether) border radius by 1000 blocks 

expand the survival world (both overworld and nether) border radius by 1000

survival world (both overworld and nether) border radius(This is my new zoom in feature. If it needs updates, tell me)

(both overworld and nether)

"nether"

WUT? WE CAN GO INTO THE NETHER?

[Edit 12/13/15 2:04AM: I thought it was creative. Sorry.]