I've recently started a PhD. I'm having trouble getting high impact authors to agree to write papers with me. Is there any ethical issue which prevents me from paying high impact authors monetary compensation, to agree to write papers with me? I of course will obey any and all paper writing requirements, such as both must substantially contribute, etc... 

Also, my original intention is that the monetary payments would be fully disclosed before the transactions, to all relevant parties, including my University, supervisors, opposing side in the final PhD, etc...

I kind of do the same thing with my daughter. I hire a tutor, but ask them to help provide her with the required knowledge, but require her to do any and all actual work.