Will knowing I cannot help market kill the sale? While I am certainly willing to do anything in my power, if and when the time comes, to help market my work, I am terrifed of doing public appearances - not because I'm afraid of doing readings or shaking hands, but because I am quite violently allergic to most perfumes. I end up with brutal migraine headaches that render me quite useless.
I suspect insisting that all signings, readings and other appearances be advertised as "fragrance-free" will not win me much admiration from either agents or publishers. Margaret Atwood has the right idea with her autograph robot machine.
There is a long thread on this in the snarkives, probably in July or early August. It's entirely possible to not do readings or public events and still help promote your book. It's not my first choice, but yanno...that's life.
I kinda like the idea of those book readings having an olfactory pat down though.