On the subject of FLARM....How about this for a compromise:
If the BGA or whoever regulates gliding made FLARM madatory for gliders, would this be acceptible to the gliding community? Because if it was then I'd be prepared to buy FLARM for my aeroplane and I'm sure many others would. Before you know it you could find that MOST GA / Gliders in the UK and possibly even Europe fitted with FLARM - it's cheap cost make it very attractive.
This would also drop the price of FLARM