I know a guy who used to work for Kramer Guitars back in the day. He was a painter and his primary job in the mid to late 80s was to paint and help assemble artist models for the endorsees. At that time there were countless big bands/artists that endorsed Kramer, from Van Halen and Motley Crue, to the Jackson family and even Johnny Cash, who happened to be very close friends with the company's majority owner. But aside from EVH, Richie and Jon were undeniably Kramer's premiere endorsement. According to my friend, no other band received more product from them than Bon Jovi did, and when they would come in to either discuss what they wanted or pick up their guitars, they treated everybody in the building, including the management, like shit and would say stuff suggesting that they should own the company because they are the reason people buy Kramers. That pissed my buddy off so much that eventually he refused to paint or build anymore guitars for Bon Jovi, so management would have to lie to him about who the guitars were for. One time, based on the designs requested, he figured out that it was for JBJ and RS, so he decided to give them a little something extra. He jacked-off into the paint, mixing his DNA in real good, and used that same paint on guitars for both of them. He said that they used them in music videos and heavily in one of there big tours, never knowing they were holding his jizz in their hands. He has about as red hot of hatred for JBJ as anyone could.
As a topical side story to this, the same guy worked with Eddie Van Halen a lot during that same time period. He said despite the fact that EVH was usually high or drunk when he came in, he always went out of his way to be cool to everybody at Kramer and was very appreciative of what they did for him. He would walk through the factory and give out VH tickets or albums or autographs, whatever people wanted.