The sixteen-year-old confessed killer of WABC news reporter George Weber told the press yesterday that they would have to pay up if they wanted to get an interview with him. During a visiting session at the Bellevue psych ward where John Katehis is being held, he shouted at local reporters, "Is this a cash offer? Cash offers only!...Cash offers only!" A classmate of the teenager's, who was also there to see him, told both local tabloids, "John was never the fighting type. I don't think anyone was afraid of him. I wished he would explain to me why. This is not usually him." But the Post spotted the other boy attempt to talk to Katehis, only to have the murder suspect say to him, "I always hated you at school. Stop wasting my visits."