There's nothing inherently wrong with wanting to make money for your work. The problem, honestly, is that a good terminal is a solved problem (c.f. urxvt, which is perfect in every way). Charging people for one would be like charging people for a vim clone. Why charge for an inferior product when someone's already created perfection? ;)
Second of all, learning shell scripting is an almost ridiculously important skill. Wouldn't it be better that you sit those devs down and have them go through a couple hours of intensive shell boot camp so they don't need your help anymore? Anyone who's a halfway-decent dev can learn the basics of shell (simple scripting, variables, redirection, piping) within a couple of hours, easy.
Second of all, learning shell scripting is an almost ridiculously important skill. Wouldn't it be better that you sit those devs down and have them go through a couple hours of intensive shell boot camp so they don't need your help anymore? Anyone who's a halfway-decent dev can learn the basics of shell (simple scripting, variables, redirection, piping) within a couple of hours, easy.