$1000 for 4 fuel filters???Are you kidding me??
Have you taken up your issues with KTM direct in Austria or wherever the head honcho sits these days???They may be open to giving you some assistance, because the US franchises seem to be expectedly clueless!!
Scroll down on this link to get Austrian Corporate;
Here is a "local" KTM contact;http://www.ktm.com/us/contact.html