I can add to this conversation I have had a 150ish average for a year and a half.
I got a coach because I wanted to be a better bowler and it was obvious that I wasn't going to improve on my own anymore. I was as good as I was going to get without help.
It cost $50.00 for the first lesson and now it is $35.00 a lesson. I go once a month. I have improved in release consistency, spare shooting and a lot of the topics covered in this thread. I had a lot of bad habits that had all become muscle memory and I have had to practice a lot to change them.
I placed 4th in a recent tournament in Daly City it was in the handicap division but I still won money.
I think the lessons were worth it
As to building an arsenal. When you go to this site it is hard not to get caught up in the purchasing of new equipment but in the beginning you really don't need to buy a lot of balls. It is really true. You probably don't have to buy a lot of balls ever...but it is fun to get a new ball. :-)
Having said that I have bought two this year because my coach recommended that I go up in weight (I have a tendency to muscle the ball) a solid particle and a pearl reactive both 16lb. I already had a spare ball 14LBS. I wasn't going to buy any equipment this year but, "hey my coach recommended I buy a new ball."
This is all I am going to buy until I get my average to a sustainable 180. I can bowl a good series (and for me that is 550 and up) but I still can't do it every week.
I am going to take advice from this thread and bowl all summer with just one strike ball and learn to make better adjustments to conditions.
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Jeff
LowRev and Lovin' it
--Well more like Medium Revs and a lot more axis tilt since I switched to finger tip.