does discipline matter at all when it comes to this doubling/tripling of day job rate formula?
Yes, but you may find it is more favourable (sometimes much more favourable) not to let yourself be pigeonholed as a certain kind of worker at all. Where possible, I'd recommend presenting your offer in terms of value it generates for your client, the way another business would rather than the way an employee would. Angle for them to be interested in results and not in any particular skills or technologies you use to achieve those results, and you change the way the discussion is framed.
However, this advice comes with the caveat that presenting things that way isn't always possible. Many clients really are looking for a certain skill set to fit in with an existing team, and you can make decent, if usually unspectacular, money with that kind of gig too. In that case, ideally you want to offer a credible rate but one toward the high end of the spectrum for your market, which brings us back to "yes".
Yes, but you may find it is more favourable (sometimes much more favourable) not to let yourself be pigeonholed as a certain kind of worker at all. Where possible, I'd recommend presenting your offer in terms of value it generates for your client, the way another business would rather than the way an employee would. Angle for them to be interested in results and not in any particular skills or technologies you use to achieve those results, and you change the way the discussion is framed.
However, this advice comes with the caveat that presenting things that way isn't always possible. Many clients really are looking for a certain skill set to fit in with an existing team, and you can make decent, if usually unspectacular, money with that kind of gig too. In that case, ideally you want to offer a credible rate but one toward the high end of the spectrum for your market, which brings us back to "yes".