I looked at suggesting my club joined ABAC when a thread appeared on these forums a few months ago. I was particularly drawn to the approach regarding coaching, where experience counts more than qualifications, and the insurance cover offered for races and their volunteer helpers. What put us off at the time were the actual costs of the insurance which weren't immediately obvious from the website.
I do appreciate that the £5 wil rise in time, and probably quite quickly, but if clubs drop out of the UKa fold you will also see an increase in the £2 addition for an unaffiliated entry fee for UKa races(There may be 135 clubs in ABAC at present but I guess that the majority of these are still affiliated to UKa as well). At present if you race only 5 times a year you will immediately be paying a £10 per year subscription to UKa to race in only these events.
For it to be worthwhile I feel that there will need to be an increase in races organised under the ABAC banner (are there any at present and if so which ones ?) and possibly pulling a few of the bigger ones across.
How many people who read these forums race in The London Marathon, The Great North Run
etc . Yes they are organised by professionals and they do cost a lot of money but they are the races that people want and I am sure they will remain in the UKa fold.
I am not pro UKa but just wanted to point out that there is a bit more to this than meets the eye.