Bad bosses get promoted, not punished

Here's "proof" of something that many of have long suspected - bad behavior toward subordinates is often rewarded. The problem is that this reeks of sketchy science. First of all, the sample group consisted of "240 participants in an online survey." Were the respondents vetted at all to ensure a reasonable cross section of age, sex, job level, etc.? Is there any filtering out of people who have an axe to grind? Also, it's not clear what is meant by "bad bosses." This is obviously very subjective. I can think of bosses I've come across who can be very demanding, perhaps making people miserable at times, but who are incredibly effective and also reward their employees generously when they produce. Reports like this can provide interesting snapshots into some workplaces, but they should not be used as a basis to generalize about the typical workplace, and they should not be taken seriously without fully understanding the methodology behind them.