OK, I'm back...
So, the gist of it is 2D wants to produce a 30mm set of six figures. It is a given that the pieces must be well designed, well engraved (no distortion, no perspective issues, no soft detail, etc.), and well cast.
The big question is what to produce. What will sell in sufficient quantities that at least the initial investment will be recovered in a reasonable amount of time? All of the comments have validity, but - and this is a big but - there is a wide variety of interests on these boards. One only has to look at the Gallery to see that. If only one interest segment is catered to, then only that segment will have any interest in the pieces, hence any hope of sales will rest largely on that interest group's shoulders. Everyone else go sit down...
Perhaps a new approach is in order.
How about a six-piece introductory set of two historical, two fantasy, and two sci-fi/other subjects. Market and sell the set as an Introduction to Painting Flats. Include a small B&W pamphlet (the previous discussion on that seems to have died as far as I know). Push them at shows, via mail order, and on this site. Make an effort to market them outside the UK and EU. I'm sure many folks on these boards - myself included - will buy a set, paint them, and post them on this site and other figure sites if for no other reason to promote the hobby.
There are any number of historical subjects to choose from, from colorful to drab from ancients to modern. Fantasy wizards, warriors, sorceresses, dwarfs, fairies, elves, etc. Space troopers, aliens, showgirls, Lili Marlene under a lamppost, maids, musicians. By all means, do something that's been done before, just change the pose and costume (where applicable), and do it better. Likewise for subjects that have been done and are no longer available.
Discuss.
Glen
(still want to do a Vegas showgirl. Mmmmm, feathers...)