I have two breba fruits on each of my two Desert King plants that I had rooted in the spring of 2008. However, both are now growing a lot of main crop figs as well that I am pinching off hoping this will give more vigour to the plant for next season. Any downside to this pinching off the main crop from Desert King (which is said to requires pollination which cannot happen here)?

I look on Desert King as my most reliable producer each year of my in-ground trees.  Because its breba crop ripens during August here this far north, they catch the really hot part of our summer and are sweet and flavourful.  Right now the main crop figs are already starting to pop out on this year's growth, but they will stop growing soon and will never develop further; they won't mature because they cannot be pollinated.  These poor doomed figlets stay quite small, so I'm not concerned that they are draining the tree's strength.  They usually start to drop off at the beginning of fall.  Then I go and knock off any remaining ones at the end of fall, just so they don't start rotting on the trees during the winter rains and possibly provide an in for disease that could injure the tree.

Otawan:Do not pinch off main crop on Desert King.
It needs those fig flower to grow and fall by themself.
When they fall out,at every spot,a new fruit bud will form,wich will be your next year breba.
If you brake them young you might disrupt the cycle,and have no breba fruits at all next year.
H2

Thanks Herman and tettix
It appears that DK and other breba figs behave like house plant 'hoya' vine where one is not supposed to remove the flower otherwise it disrupts the flowering cycle and cause long delays to flower again.
It is better to ask and learn. Thanks again.