The VPS market is a very competitive market, meaning that pricing and quality matter -and mostly determine which plans to provide. However, while a customer initially purchases a given plan, and benefits from a recurring lower cost, over time he may prefer to have some extras, while keeping his current plan unchanged in price and basic specifications. A customer may also find a different usage for a VPS that either the current plans at C-Servers don't directly provide, or market conditions don't allow for. These addons fill such a gap.