LOBBYIST MOVES TO OTHER SIDE OF THE LOBBY
When Mayor Koch killed the proposed New York City theater ticket tax, it came as no great surprise to Peter A. Piscitelli. ''We lobbied it good,'' Mr. Piscitelli said yesterday, the day after the Mayor offered a municipal budget without the tax. His old friends in city government, he said, had not told him in advance in so many words that the tax he was working against was out. ''But they'd smile when you talked with them,'' Mr. Piscitelli said, ''and they'd say, 'Hey, you might have a winner.' '' He had no trouble reading signs like that. He knows the game and he knows the players.
