And look at a few other popular series.  Want a 
Rayearth cel of Hikaru, Fuu, or Umi?  You 
could buy two of 'em for what you'd pay for a 
similar-quality Eagle.  Sakura's video-stalker 
girlfriend from CCS is pricey as heck, 
but no more so than Yue or Clow.  I just picked 
up a two-pack of Gundam Wing girls on YJ 
for 4000 yen (Dorothy and Relena), but lost a 
single Wufei the night before when I bailed out 
at 8000.  And any Sailor Moon fan will 
wince in pain at the prices requested for first-
season villainous bishies.

It's not really down to the gender of a 
character, I think, but to their global 
popularity... which is in turn down to the 
nature of the characters themselves.  The 
characters you list -- Belldandy in particular --
 are really some of the best characters in their 
particular series.  But think about Bel's little 
mortal boyfriend.  He's basically two-
dimensional in personality; hence I haven't seen 
a lot of people prominently feature him on their 
wishlists.

Ryoko is worth more than Tenchi, Lina is worth 
more than Gourry, Quon and Mishima Reika cost 
far more than Ayato, and Lime absolutely 
trounces Otaru in the price department.  On the 
other hand, Dark Schneider is worth more than 
Arshes Nei, Wolfwood's pricier than Milly or 
Meryl, and Vicious will cost you more than Faye-
Faye any day of the week.  Why?  Because these 
are the most intriguing, humorous, fascinating, 
or compelling people in their respective shows.  
They appeal to us on an emotional level which 
has nothing to do with gender... the fact that 
some of 'em are also sexy as hell only enhances 
their sales appeal.

Yes, I do believe that general prices are skewed 
somewhat towards girl cels because the fanboy 
market has historically proven them to be good 
sellers.  However, that's only a small part of 
the issue.

The problem you have isn't liking female 
characters.  It's liking good characters 
who happen to be female.  ^_^