Because you'll come back to it.
Most card makers buy one sentiment set, use it three times, and then need something completely different. A birthday card in the morning, a thank you card in the afternoon, and nothing on the sheet fits either one.
The Vault is the opposite of that. Whatever card you're making today, the words are already there.
And it's still growing.
The Vault is growing to 20 sets, and then it's complete. 13 of 20 so far.
Every new sentiment set I add is included free, for everyone who already owns the Vault — you'll simply find it in your account. The price rises as the collection grows, so the earlier you join, the less you pay.
When it reaches 20 sets the collection is finished. Everything in it stays
yours exactly as it is, forever.