I have seen some actual payroll numbers and can say 100k is way off except in the very best joints where the man is a part of the profit share. The guys at these levels are all gringos with past bookmaking experience in the US and in most cases wouldn't stay in CR if they had to "settle" for what the Ticos and the non-experienced gringos get out of it.
For a gringo learning the ropes the net pay is about what he could earn working in a basic office job in the US, but most seem to love the atmosphere and don't care that they work endless hours. For a Tico the wages put them in the top 5% of the population, so needless to say they are doing very well for themselves. And despite the belief that the cost of living is lower, the people that do these types of jobs usually live a lifestyle that costs as much or even more than the lifestyle a middle-class American lives so the cost differential doesn't hold out. You really have to lower your standards and lifestyle to get ahead on this, something these guys don't seem willing to do. That means things such as living in lesser neighborhoods, going without a car, and rarely eating out except in sodas. Good luck finding guys making a dime a week willing to take all these measures to get ahead.