How many of you have a rule (written or unwritten) that says you ARE NOT allowed  to show up early and get a couple practice games in on the lanes you are bowling on?  Even after they have been oiled down?

I'm against it, but it happens a lot in one of my leagues.   Once the lanes are oiled down, they should not be bowled on until start of the league.

Never seen it. There's no bowling after the lanes have been oiled until league starts

Likewise here.  Your league should ask the house to forbid it out of fairness to the rest of the bowlers.  Warming up anywhere else but the league lanes is fine.

I bowled a league  a few years back where the league President would show up early, and bowl on someone else's pair(from the same league) and her pair would be locked. If she bowled well, she would actually bowl during league that night. But if she was having an off day, the bitch would put herself in a blind. She had the highest average for the females of course.

I'm amazed that this thing is as widespread as it seems.  It strikes at the very heart of fairness. 
Every team should at least be able to start on a level playing field, rather than one manipulated by some idiot looking for an advantage.  And we wonder why people leave the sport??

I will let Edward James Olmos explain how you get ahead.  Hard to be my age and not be cynical.

Most centers aren't going to allow a league rule that costs them revenue. 

They have other problems if they're worried about that little revenue amount gained from it.

Before I retired from bowling I bowled in a Thursday night league.  The house would allow bowlers to practice on pairs that were already oiled but not bowl on the pair you are scheduled to bowl on that session.  So basically, they could either 'burn in' a shot or 'shimwreck' the shot.  One of the person's who would bowl is actually the league secretary/treasure who is also a board member or was a board member in the local association.  The only thing that was really fair in that league was the prize fund.  I was not a team captain and I don't remember if this has been brought up in the past or not but based on what I see in the posts, I do believe the center is not going to turn away any revenue even for how small it is. 

Most centers aren't going to allow a league rule that costs them revenue. 

By me, many houses oil for the early shift just before league, so it costs them nothing.

Some houses oil around 1 or 2 PM and allow open bowling until before the first league , around 6:30 PM.

IN the house i bowl in they allow league members to bowl on the lanes beforehand but not your own. Pisses me off as last year i had three guys who always bowled next to me because of the schedule always practicing on my lanes because they didn’t want to carry their equipment far. So my lanes were chewed up every week and they got to bowl on the fresh. Eventually i said something