"Do I get a bonus when I use TE Tokens?"
Yes, when you fund your Piggy Bank with TE Tokens (TET), you get a 10% bonus. For example, when you deposit $5, you get $5.50. If you deposit $100, you get $110.
You can buy TET in Waves Exchange. When you use the payment buttons for TET through the Piggy Bank, your purchase is added automatically and instantly.