I also monitor the forum linked to the Leisure Owners Association (LOA) as my first boat was a twin keeled Leisure 17, and that forum is much busier.
I believe that the main reason is that the LOA covers a range of yachts from 17' to 29' and that the owners of the 17' ers are likely to be first time owners and/or fairly inexperienced and therefore will ask lots of questions and luckily the more experienced provide answers.
By comparison, it unlikely that a 27' Albin Vega will be owned by someone with no prior experience.
Regards
Ash

Vega1789
http://www.leisureowners.org.uk/discus_1/