Typically in coin operated billiard table rules, pocketing the 8 ball on the break without scratching is a win. This is due to the fact that once pocketed, the 8 ball can no longer return to the table.
Conversely, most casual players will elect to continue play, in order to their money's worth, and declare the highest striped ball left on the table to be the acting 8 ball.
As far as scratches go, I believe the player's inning is over, and the incoming player takes the table. Of course, no spotting takes place.
Generally though, for tournaments, coin operated pool tables are unlocked, and thus, can accommodate standard billiard rules.
See 8 ball rules for coin-op pool tables on this site for full details.