Almost every guy has a bucket list of having two providers. Not sure if their is a huge number of men interested in the opposite.
I will say if you planned on covering the house fee and double tip, there would be more people volunteering.
I remember a guy on this site that was willing to pay to watch me in a session. Once I started showing interest, he start showing his true intention of having me act as a provider for him. If you are not careful, You may get an unexpected prostate massage in the middle of a session.