Lets get the simple stuff out of the way first. To create Odds on any Event is relatively easy, your not talking anything more than basic Maths and if 10 people price up a Game there shouldnt be more than 1/2 pt difference in the initial line, where the difference comes is how the individual Bookmaker perceives this line.
While People say things have changed from Years ago, I still think things find their own level the same Today. There are many categories of Bookmakers and where one is at the Trough decides ones policy. If like a lot of Books years ago you know your sport inside out you will have leans and basically be Gambling but with the Vig in your favour. If your a book with a large clientel you can afford to lay absolutely diabolical Vig and get away with it, possibily not as much today. You can be at the cutting edge like pinnacle, wheeling and dealing or like a lot of Books lay down standard -110,-115 Vig and take what comes. Some people call these slow Books but you have to lay a bet at some stage, better -110 than -105 all the time.
What has changed is everything has got more technical in the Industry where workers dont have the chances like years ago to make an impression on their Bosses. I started Bookmaking at School at 13, joined the Industry at 18 and was a district Manager at 21. That is an impossible position to attain nowadays no matter how good you are, and there doesnt seem to be the Money there either.