I would assume the quality of the pitch would determine the outcome too. It stands to reason that some people would be interested and others not, it's no different owning a shop in that respect, who is your customer? Some will buy a little bit and others will buy a lot and some won't buy at all and some won't even go inside. Do you give up because of the latter two? or do you give a great service that people like, that they feel valued, paid a fair price and leave them feeling that they not only that they want to shop again with you, but invite people they know to share that experience too!
I am a novice at this, infact I'm working on my pitch for my first go at this method of selling, but I believe that using some common sense, sounding sincere, being respectful and being prepared to put the work in. This might sound old-fashioned, but I believe that these qualities are nearly always what your clients expect and as such, if you've done your homework then there's every chance that your rate of success will be better than if you applied yourself and approach things as being all or nothing.
The best deals in my experience are the one's where there is a win-win, if you forget that, it doesn't matter how you pitch your business, people won't trust you and that is the real deal breaker. I feel people need to be accepting there aren't any real short-cuts to become a successful business, no matter how you look to generate sales.