I used to work for Offensive Miniatures who had a reasonable range of Napoleonics in 28mm. Their blister packs of castings were about 8 figs for £10, a bit more for command packs.
Painted stuff: yours work out at £25 for 4, about £6.25 ea, which considering I charge £7 to paint a 28mm Napoleonic before you add the cost of the casting is pretty good.
If its wargammers you are aiming at I think unpainted castings will be what they want (someone did suggest that earlier).
I have been gaming since I won the 1977 Northern Ireland Napoleonic Wargames competition with and Austrian Army (there were only about 10 players in though!) at the age of 16, and I am sure most gamers want to paint their own figs.
Having said that the Del Prado Relive Waterloo and Austerlitz stuff goes like hotcakes on Ebay, mostly to Wargamers I suspect. I have many in my own armies, but even then I repainted the cuffs etc to the regiments I needed. So prepainted 28mm stuff has its place if cheap enough.
There are some cash rich and time poor gamers who get people like me to paint them, but even then they want them done a particular way. I think the secret might be to get some coverage in the Wargames mags like Wargames Illustrated or Soldiers and Strategy. Guy at the latter is really friendly and I am sure would give you some coverage.
I think I will be getting some for my armies though.
Did you scan them and zoom them down from your 1:30 stuff?