Only bookmakers that go broke are the one's that gamble recklessly(Lenny cascade is an example)
I do not know one bookmaker with a decent amount of clientele(not booking to sharps only, maybe a handful as a courtesy) that went out of business holding positions. They do not decide before hand what positions to build, they let the clients decides. Go ask Skip at grande if he has positions on sunday's. It is ridiculous and naive to think that they do not. Sure in a perfect world you want a ton of volume at -110 and to even it out..................don't work that way
Like i said before............been around this my whole life...........know a lot of bookmakers.........still going, retired or long gone...........all did VERY well for themselves...............and the ones I worked for never layed off one bet.