This time/effort will directly impact whether solo/private group players can get indirectly disruptive to the all group or not.
A group of players can almost certainly more directly impact the background simulation than a single player...the solo player is going to really struggle to massively impact trade prices etc.
Actually, potentially the most disruptive group is the private group but with the instancing system the way it is; the private group is absolutely crucial to enable groups of friends to play together in a deterministic manner. If I was worried about manipulation (which I'm not); it's a private group who decides to fly a whole convoy with a few fighter escorts to flood a market. But then again, any large group of players may be able to do this even in ALL with a bit of co-ordination.
So your independent trader in SOLO or ALL is probably at a massive disadvantage when we take group dynamics into account. But they have the advantage of flexibility and freedom...
The logical group for your min/maxers to play is PRIVATE but good luck with taking that out of the picture...