Larry, in 2012 the federal government spent $1.7 BILLION on endangered species.  That was more than the feds spent in 2011, which was more than the feds spent in 2010.  In other words, funding for endangered species is increasing.  Endangered species can't be hunted, so federal excise taxes (PR funding) doesn't even come close to the amount of federal money spent on wildlife conservation.

http://blogs.scientificamerican.com/extinction-countdown/how-much-did-the-us-spend-on-the-endangered-species-act-in-2012/

And your argument that hunters also pay income taxes is a red herring.  Yes, it's likely that the average hunter pays more for wildlife conservation than the average non-hunter, because hunters pay the federal excise tax as well as for hunting licenses and tags.  However, hunters comprise less than 10% of Americans.  So non-hunters, as a group, pay far more than hunters in income tax, some of which is spent on managing wildlife in refuges, parks and other federal lands.