Well, anyone charging $150 to solder is flat out ripping you off, and I would say thanks but no thanks. Don't think I ever paid even HALF that for the labor on a mod. The bulk of the cost is always the new hardware.
It all depends of course. I've learned to solder and have done some pretty complicated projects. But that was mostly just for me to learn how to do it and get a few specific things done. Now that I know I can do it, the discovery aspect is out of the picture, and I have to decide if it is worth the time to set up my work area, get out my tools, and work through the challenges of getting a project done that I've never done before. It might be kinda fun, but it also might be worth it to pay someone else to do it who is very experienced and able to get it done right with much less effort.
I've actually asked myself how much I would charge to do similar work. I've never done this job before, but in order for me to stop my life and sit down and bang out some delicate projects like this one, it would take a fair amount. Its not my full time job, and I'd have to squeeze it in around everything else. I think it would have to be in the $60 - $80 an hour range to be at all interesting and then that would probably just feel like breaking even for my time.
Obviously someone who has this as their actual job can do it at scale and make it more affordable, but above is the type of bargain that I have balance with my own time.