You're not sharing profits, you're sharing responsibilities.
When you were working for a known salary, you could focus on your own shit and not give a damn about the company's problems. Feeling demotivated today? That's fine! Slow down your pace knowing the reward by the end of the month will always be there waiting for you. The company is not doing well? That's not your problem. You have the right to be paid anyway.
Then you got a new deal.
From now on you're going to be rewarded according to the profit 'you' generated. That's a big change.
It means you won't be rewarded for doing your job, completing assigned tasks. You'll be rewarded for doing a good job, a job that delivers actual results in the profits. You got yourself more responsibilities than the associates but you don't earn what they do. Do you think the profit share of the associates are anyhow related to their actions? Bad decisions may contribute to a smaller cake but it doesn't change the size of their slice. You're punished for your bad results but half of your good ones belong to the company anyway.
- Taking a nap?
- Organizing your desk?
- Taking care of your personal problems?
None of these actions are contributing to your month revenue. Apparently, at least.
- Do I have enough time to finish this project?
Not only are you a part of the company's financial situation but you also don't have a word among the associates. You can no longer focus on doing a good job, doing what you like, now you have to adapt it to whatever gives the most immediate results to the company. It'll be too hard to prove it was because of you otherwise.
Now unless you're already big shit in the company, that's just an awful deal. Before agreeing to the new terms, a drawback in personal matters wouldn't reflect in reduced budget by the end of the month. You could actually focus on getting it out of your way.
Every. Second. Counts.
You just don't know if you can take it slow. The next month you'll be working with reduced budget to preserve your lifestyle, handling that personal matter and still trying to finish some great idea to share the profits.
Can you really isolate the profit 'you' generated?
There are a number of ways your company can lie about who was responsible for the profit increase. How well do you know your company to tell they're not trying to diminish the results of your work to the most they can? Now unless you have access to financial transactions inside your company, you're left with trusting their word. It doesn't matter if you're friends with them.
Maybe you had this wonderful idea that is going to solve a lot of problems at the same time. But maybe they were "already working on that". Sorry, we can't pay you this time. That was Joe's idea.
Nothing personal. It's just business.