Not those scales.
I'm talking about the exchange of money for services rendered: the fact that good, kind people are paying their hard-earned money for you to teach them something.
There are two ways it could be out of balance. One is that you give too much: time, energy, planning, advice, music. It could be simply that you spend more of your time thinking about one of them.
The other is that you give too little. Jane Bastien ends every lecture by saying, "Teach every student as if they were your very best." It's easy to find inspiration in your most talented students. As I've gotten older, I've grown increasingly fond of my average ones. The ones who make me work. The ones who challenge me to make it possible for them to play well. The ones who don't teach themselves. In my case, the ones who require me to write pieces specifically for them.
Here's what I ask myself about each student. If any one of them quit today, would they feel good about what they'd received and would I feel good about what I'd given?
Are your scales even? Is there any student you've been giving less than you should? One who's getting more than they've paid for?