From what I've seen and heard, it’s the hassle part that keeps a lot of them away. When the IA test went multiple choice and our 135 required mx recurrent training became an FAA acceptable means to renew an IA, the numbers of IAs amongst the 400 mechanics at the day job increased by 30%. However, after the 1st and 2nd IA renewal cycles, the active IA numbers dropped back down to the 10% level mainly due to the BS they ran into using the IA. Plus a few guys got stupid and did some questionable outside work that almost cost them their job and their A&P.
Interesting. When I went through the NEB process, we were told an IA was not considered a designee position and those that did have an IA should be very careful not to intermix those two separate functions. Has this changed?