A simple explanation that occours to me: Many of those who answered tabs are actually using an IDE which inserts spaces when they push tab. They believe they a

A simple explanation that occours to me: Many of those who answered tabs are actually using an IDE which inserts spaces when they push tab. They believe they are using tabs, because they've never realized that this is going on. People under that misapprehrension are likely to be less skilled. Additionally, if a coder, is in fact, deliberately choosing the use tabs, they are going against the majority opion of coders and almost all style guides. That attitude might be correlated with lesser income.