any money in this field?

I say go for it - advanced car audio experiance will directly impact your ability as an electrician. 

If you develop strong troubleshooting skills and basic understanding of controls (ie alarms and relays) you will be a step ahead of most of the people at the trade school and you can spin your experiance to prospective employers.

While I was in college I installed at Circuit City and employers were always impressed when I talked about designing custom control circuits for cars (ie tricky alarms / remote starts / automation).  The troubleshooting skills I picked up still to this day help me in my career.

I guess what I am saying is don't worry so much about the money, look at it as a learning opportunity that will help you earn more money down the road by utilizing the skills you picked up.

I would say that car audio experience will help if you are going to be an Electronic tech, but not an Electrician.  Electrician's work on High-Voltage, 120v+ ac systems.  I have a degree in Electronic Engineering and it helps almost not at all with 120v high voltage circuits.  I've had a few people work under me that had home and commercial Electrician experience, and they were the worst installers on the planet.

If you work for Best Buy, get certified.  Go for both certifications right away, becuase you get raises for each one you complete.  They have great study guides available for the employees and the basic study guide is so close to the actual test, that you can know NOTHING about installing and still become MECP basic certified.

If you want to get rich in this business, you've got a long road ahead.

It depends what kind of electrician you want to be.

For a residential electrician I would agree with you, that takes basically no critical thinking, but to be an industrial electrician it would be extremely benefical.  I do believe that industrial electricians are positioned to make quite a bit more then residential, but that may very from place to place.  My Dad is a union electrician that does industrial and he does quite well year to year.

When a company calls in an electrician to troubleshoot a process machine that they have no prints on at 2 am on a Saturday if you are good enough you can name your price.  I know, I've done it.  $100 an hour to troubleshoot  relay logic is nice, and very similar to what you may see in an advanced car alarm.

I'd much whether do one Alarm/Remote Start a day than 5 CD playersa day for  the same amount of money.......The shop you work at plays a big role also.

Amen brother....