GMaverick
The simple answer to your question is NO, so why try and get round the law ?
Put it this way you charge to take someone up and you hurt or kill them you wont be worrying about cost sharing you will be asking for some help paying a large legal bill to keep you out of the nick.
Cost share with friends fine, advertise in a club fine, fly an owners machine for free fine, position an aircraft for someone fine. As soon as money changes hands you are breaking the law.
You can do anything you want until something goes wrong !