Theming your tournament sets up a whole world of opportunity. This allows for niche players and others to express their interest in the tournament.
Aside from theming you can also them the marketing to all things ... the tournament has to offer. Tournament goers are excited to spend their dollars on items they surround themselves with.
Creating vendor relationships and sponsor relationships fits under the theme of your venu. When hosting it is important to build up your vendors so they can schedule out in plenty of time their presence.