Go halfs? Are you taking the p*ss ! Are you wanting to keep the footage?
I really want a stranger filming my cum face and spending the next 50 years wondering where and when the video will appear next.
However I'm feeling generous, pay for the punt with a top bit of totty, give me and her £5000 each and we'll both sign a model-release form for you to use the footage as you like, oh and we'll both be wearing masks....and burqas.
Alternatively if I get to keep the footage shot directly to SD card at time of punting, I'll only charge £250 and the price of the punt for you to film/watch while I'm putting her to the sword