The Golden Corral is an all you-can-eat buffet of food.
People go and eat twice as much as they normally do because it's included in the price.
The amusement park has a wristband you can buy for your kids that give them access to unlimited rides.
Kids love this. And their parents try to convince them to go on ALL the rides because it's included in the price.
The Bible says in 1 Corinthians 6:20
For ye are bought with a price: therefore glorify God in your body, and in your spirit, which are God's.
If it's included in the price, why don't more Christians double-down on NOT sinning, so they can glorify God MORE?
God's not giving you a wristband, as a reminder that you can offer unlimited service to Him. Instead, He bought you with a price.
Why wouldn't you want to serve Him, love Him and glorify him more?
After all, your body is the temple of the Holy Ghost; and it's included in the price!