I'm not here to say that 3D flying is BAD, or that it shouldn't be allowed at all clubs. But, There are some issues surrounding it that need to be addressed for the good of the club and all RC fliers.
I see guys standing on the runway doing their 3D flying all the time at my club. I've questioned other members that were there at the time about it,and got replies that. That's why he comes early before everyone else or He goes to the end of the runway.
I appreciate the implies courtesy, but He wasn't doing his flying before anyone else was there ( I couldn't have questioned it if I and the other members weren't there. And standing on the runway at one end puts him directly in the path of either landing approaches or any aborted landing.
Although the AMA rules apparently no longer state that you must establish a flight line and remain behind it. My club HAS established a flight line(and installed Safety fencing down it's length). Even if a pilot were at the field alone when an accident happens, I don't think the insurance report is going to get any further than the pilot was standing on the runway, in front of the safety fence any pilot needs to extend his level of courtesy to not only avoid standing directly in the path of other fliers, and not putting others in harms way; But also not creating Liability for others by jeopardizing their insurance coverage.