I have been a member of the AWGB for a number of years and personally I think the current rate of £16 per year for adults is very good value for money if you take into account some of the things that includes, such as
Various free training programmes
The quarterly newsletter
Free membership for junior members
3 day seminar every other year with first class presenters from around the world
Assistance programmes for people with limited resources for seminar attendance or membership fees
Affiliated clubs get free insurance covering club events and they can apply for a grant towards demonstrator costs
Discounts from many suppliers for members
For those that want it there is a free members services listing on the website
If all that wasn't enough, the AWGB also promote woodturning to the public at various events throughout the year, they are the closest thing we have to a representative body with organisations such as the Craft council, HSE etc.
Notice I didn't mention the website, they also have one of those too at
http://www.woodturners.co.uk and I think the navigation is very simple. Their forum is also simple to use. All the people behind the AWGB organisation are volunteers, they don't get paid for their time.
I agree that if I wanted to take the selfish approach, I could possibly do some of the above as an individual but a) it would cost more; b) I would not be as effective in furthering the craft and c) I would not meet anywhere near as many other woodturners I can talk to for advice and support when needed.