To whom it may concern,

Those who can't afford it will have no problem making the change to a less expensive option.

While you think you're doing the right thing, you will only ostracize the part of your consumer base who falls into a mid-to-lower tier economic status. Those who can afford it will be tempted to jump ship once the trend of lower costing domains become a social norm. 

The world doesn't rely on ".com" anymore and they certainly won't be hesitant to change if you decide to place pressure on your loyal, paying customers. 

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