I'm sure you didn't want to Instruct forever. Why did you become an instructor? Answer Honestly now
Actually some do, like me who has a successful business and wanted nothing more than to instruct.
bose-x and MJ are spot on this subject and their comments sum up this game 100%.
Of course there are many excellent airline pilot instructors in GA, but the passion was there from the begining, not as a desperate last resort because the plan A failed. If Instructing was not in your overall game plan for a flying career, please please stay away.
If you compare GA with the other instructing such as microlights you we see the evidence. Microlight instructors I know earn 30 - 40K a year BECAUSE THEY ARE NO HOUR BUILDERS WHO HAVE PUSHED INSTRUCTOR PAY AND CONDITIONS DOWN , AND THEY THEREFORE EARN A REASONABLE HOURLY RATE.