Here's something weird:
Double Sided Lance 3702 weight 1.5
requirement 9
spd rtng 93
weapon length 130
swing damage 16, blunt
thrust damage 32 pierce
Couchable
Battle Fork 3150 weight 1.75
requirement 8
spd rtng 92
weapon length 142
swing damage 21, pierce
thrust damage 32 pierce
Notice how the battle fork is just 1 speed slower, is 12 points longer, deals the same thrust damage and has 21 pierce damage on the swing compared to 16 blunt swing on the double sided lance. It also has 1 less requirement and both of them have no penalty when used with a shield.
Either the Battle Fork (too ugly, I would never use it) is too cheap or the double sided lance is far too expensive.
IMO, the double sided lance should be between the battle fork and this:
Ashwood Pike 2268 weight 3.5
requirement 11
spd rtng 90
weapon length 166
swing damage 18, blunt
thrust damage 31 pierce
Can't use on horseback
in price. I would think about 2600-2800 gold or something.