I agree there is something to be said, what I would say is that it looks very similar to a piece of cloth glued to a piece of cardboard.
Dot Ties: They're too formal, it's one step from wearing a satin tie to a job interview. A tie like Mr. Pinks would be a much better choice. I doubt that they'll be offended, but they'll probably wonder where the wedding that your attending is taking place, or possibly wonder where your speaking arrangement is being hosted.