Viper93 - A good question. And I started to answer it in my head a number of times before realising that the answer lies in a long list of small details. The venue has grown to be what it is over the last 3-4 years. Continualy being tweaked with GPL in mind. In contrast we have been working with LFS for a much shorter time period and it is nowhere near as integrated as our GPL package- yet. We are working on it but it is not there yet.
A few illustrative examples of GPL integration
1) Automated lap time capture and and display with driver names on Race Control Monitor
2) Fully automated lap time to web site mechanisms
3) Printed circuit diagrams for visitor usage
4) Car setups tuned for beginnners and experienced drivers
5) Separate physical timing bars for GPL lap data
6) Automated multi car setup utilities to minimise gaps between races
7) 100's of GPL specific tweaks to optimise performance
8) etc
I'm not saying our LFS setup is poor but the GPL experience has a 3 year head start. That coupled with what we have done to minimise the common experience that GPL is too bl**dy hard
Happy to talk more when people are here ... but must get back to work now ...