Its a weird one.
I run a poker podcast and try to do the best to "market" it at poker events. Sadly we have zero budget, so homemade "patches" are used as we cant currently afford the costs. We also enter teams in national poker team events and get as many logos on the players as poss. As presenter/founder ill wear the logo everywhere i can to help push the brand. This prob is helped that i am one of those chatty/jokey players at the table and find it easy to get into convos regarding the podcast as much as poss.
However, i would say, that i have a lot more convos started at "smaller" events ie APAT, than i do when playing GPS', UKIPTs etc. Think its more of an interest to a recreational player, and thats precisely our target audience. We are also lucky to have people that will wear our "patches" in any tourny they play, for free, as they are willing to help push the brand. Obviously our next move is to get some patches made up (bloody expensive mind!)
As for DTD, im pretty sure 80% of UK poker players know about DTD... i mean its the premier card room in the UK. So is there any value in patching people up? I suppose if people are doing it for free, there is no harm, bar the costs of making the patches. Im sure DTDs marketing team have looked at it before, but with the lack of televised poker in the UK, i cant see it really breaching a massive audience.....