Steerpike is right to a point. Trashmanf is as well. Look at it from a spectators point of view. Think back to when you first saw good flourishing.
I'll start with trashman's statement.
The first things you saw that got you into flourishing were videos from De'vo, Jerry Cestkowski, Dan and Dave, or Daniel Madison (Or any other very good flourishers. You're mind was blown when you saw these videos and you wanted to do the same thing. I know this because of the reactions I've seen from people who I've shown Portable Playground or De'vo videos.
Now, imagine if you never saw these videos. I come up to you one day and say 'hey look how awesome this is' and it's some fanboy who finally learned Pandora without dropping the cards and it takes him 3 minutes to complete the cut. (aka noob crotch shot video. You'd be like 'what the hell is this?' That's how it is in real life. If you work really hard and become very good at your flourishes, then you will impress people.
I'll move on to Steerpike.
I use flourishing for myself mostly. However recently I've found that flourishing is an amazing ice breaker. I have gotten fairly decent at flourishing by now. It works a lot better for me that the old 'hey want to see a trick' and then go into my routine. With card flourishes people come to you. If I'm sitting somewhere doing flourishes and people see you, they want to see something. Now I's like to say I've never gone up to someone on the street and done a flourish for them. That's not how it should be done. I don't always use them either. But if I'm sitting casually with a bunch of people I don't know then I will just sit back and then watch people stare. They are extremely visually appealing when executed right.
Like I said, It gives me a good sense of accomplishment as a hobby, and a great ice breaker. I also show off every once and a while

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I'd like to add one more thing. I don't konw if Steerpike was trying to get at this, but I think he was.
He says 'why should it entertain me?' I think the real question is this. How can we make this wonderful art more entertaining to a laymen? How can we incorporate this into our magic, or even a show completely about flourishing. A juggling act as mentioned before. I think that Jeff McBride has found something good. His shows consist of a lot of flourishing and he's great. But most people use it as a way to show off skills they don't have. I know that's harsh but that's the reality of this media section and youtube. Don't get me wrong, there are some real entertainment jems that pop up here and there. But it's gotten crowded with people showing off how they've learned the new Dan and Dave flourish and want to be cool. I have never posted a video here because of the fact that I don not believe my flourishing is up to par with these 5 star videos. Videos that are not amazing should not be posted due to the reasons I stated earlier.
I'll leave it at that. I'm sure more will come to me later.
peace
-Kevin