Honestly - nothing... I think having a template (beyond perhaps styling and branding which most companies have already defined) for a presentation of any kind seems wrong. Any presentation, whether it is a pitch or a technical seminar, should reflect the person giving the presentation. Their vision, personality and expertise should be projected and to do that you need the presentation to be truly unique. A good presentation isn't defined by a bunch of slides or a specific format. Sorry to be so negative, but I am the sort of person that would happily pay a few dollars for some things I felt had good value and saved me some time, but a presentation slide deck isn't one of them.
A personal presentation / slide critique and suggestions for improvements I would maybe pay for if I felt it was a really important presentation, but I don't know if that is a viable business either.
A personal presentation / slide critique and suggestions for improvements I would maybe pay for if I felt it was a really important presentation, but I don't know if that is a viable business either.