Having just returned from almost 7 weeks in the USA (not bowling related - but of course I bowled while I was over there!) I can tell you....
There are MANY ditches !
WHY - Because if bowlers (even wanna-be chuckers) can't average 200 and swing the ball a mile, they go to a bowling alley where they can.
One bowl I went to in Miami, Florida, I saw a junior bowling league where the mean average was over 200...
I had a practice on a set of lanes next to the league, and thought I was going to see some tallented bowlers.
While I practiced (trying to play down the boards at about 6 or 7 board) I thought the lanes weren't that easy...
Then I saw the kids bowl. Stand left, throw right - no control, no accuracy just soft, soft balls and maximum revs (several no-thumb bowlers - no offence Belmo

)...
They had almost 10 boards at the break-point...
I moved inside, cranked the ball and couldn't miss the pocket...
went back to the 'down the boards' shot for a challange.
This was not uncommon in many of the centers I went into. Hardest one was the Kegel Training Center - but I can assure you, it was easier to carry there on a sport condition than in many centers in Australia I have bowled in laying sport conditions!
Wanna challange - come to Darwin...
he he he...