Its ok to pay BIG wages!
Think of your food or toys that you give your dog as their wages. Sometimes it's ok to give a bonus as it will help improve engagement for your dog!
For example:
If your dog gives you a simple easy recall with no distractions, you can give the normal one piece of kibble.
If your dog gives you a recall, in a highly distracting area, you can then give multiple pieces of kibble or even upgrade it to chicken!
This means you have paid your dog for the quality of work they are giving you. This helps improve the likelihood of your dog repeating the behaviour again. This also starts the basis of you will always have something better than what is in the environment.
If you keep the wage the same for different levels of work from your dog, your dog might lose interest in the wanted behaviour. The distractions can then become more valuable, as your rewards have become too predictable.