Profit doesn't happen. You make profit happen. Some businesses are fortunate and money just rains down upon them. But, for the other 98%, profit is something you have to make happen. It doesn't just come to you.
One (of many) of the reasons profit doesn't just come to you is sneak charges. I just got one of my three AT&T bills this month. This one is for internet service. In looking over it, I noticed this....TS360 Backup and Support = $17.61. Furthermore, there is a separate phone number to call for questions about this charge. What is this, you ask? I don't know either. So, I called. And called again. Finally, I did get a nice lady on the phone from this AT&T product unit who explained that this was a backup system for my computer. Yeah, I never subscribed for that. Yeah, that's kind of expensive even if I wanted it. She was nice enough to remove the charge that I didn't subscribe to.
The point here is that you have to pay attention. Every month. Every bill. AT&T is not the only offender. I've seen this with utilities, cable companies, phone companies, etc. If you don't recognize a charge, call and investigate. Don't let it go because it is small. Small adds up. Eventually, those layers of expenses will eat away your profits.
If AT&T eats your profits, where is the fun in that?