Yes

How does this compare with parser combinators?

This is just an alternative syntax for regular expressions. Parsers can also handle non-regular inputs(context-free grammars).

Any stats for which keys are pressed the most frequently?

I'm not currently saving logged output, but that's a good idea!

Not everyone can afford to pursue their passion at the cost of a cut salary. A common case would be the need to support a family, parents, relatives, etc.