rock and cypherdoc please publish your list of services with zero confirmation transaction you provide.
I'm getting mad ...... I WANT TO BUY !!!
actually, back in the day, i used to do it all_the_time with my newsletter. never a problem.
Zero-conf transactions did make some sense for worthless things like your newsletter, but those days are behind us after half a decade or working on trying to fill 1MB blocks so a market could develop.