Are there any sports like that? I mean there are sports that are fun just to participate in, whether you've spent a lot of time practicing or not. And I'll grant you that bullseye pistol isn't one of those. (Though a lot of folks feel the "practical" sports are so.)
But I'm not sure there are any sports, from marbles, to frisbee, to curling, to shooting sports SASS, IDPA, USPSA, Conventional Pistol, IMHSA, PPC, International Free Pistol, and on and on -- that you'll be successful/competitive/winning at without intense practice.
I mean, you wouldn't shoot bullseye all year and then show up to a USPSA match and expect to be in the top 75% any more than I'd shoot IDPA all year and expect the same in a bullseye match.
...
Which I guess leaves us back to the question I asked you before: Do you want more shooters to participate, even if they can't be dedicated and "serious" competitors? Or would you prefer they didn't bother?