I think it's probably more than half the draw. It cracks me up when people don't bat an eye at a single pilot in a two place, but look down their nose when they see a single pilot in a four place. Not sure what you mean about aerobatic capability. The Musketeer had a four place aerobat, probably some others. In an EAB, as long as it can take the projected loads, who says you can't do aerobatics?
I have a two seat airplane and have someone in the front cockpit maybe a couple times a year. Doesn't hold much baggate, either.
There are a handful of aerobatic four-seaters, but they mostly look to be older certified ships (which takes them out of consideration for me). Looking at four-seat homebuilts it's even a smaller list--in fact the only one I can think of offhand with appropriate G-limits is the Velocity family. And from reading some reviews, it seems like the handling is not that "sporty"--for example the Kitplanes review of the Velocity XL notes "fairly heavy control pressures make the airplane stay where you put it in pitch and roll...The sidestick option might reduce the control movement and hence the leverage contributing to the control forces " and "Most Velocity pilots will seldom find themselves in close formation with other airplanes. Probably that’s a good thing: It is not the airplane’s strong suit. It is a challenging airplane to fly precisely in proximity to another airplane. "
roadable 4 seater that cruises at 170kts., stalls at 30kts., and is aerobatic with a reliable engine.
Thank you for more succinctly stating what I was talking about.
