I was TG5 many moons ago and certainly made more outside the wire... albeit inside a foreign wire.
Theres certainly quite a few job recruitment posts on the TG5 facebook page and usually they offer pretty good money although I've no idea what an SAC(T) picks up these days.
It's also possible that BAe are actively recruiting for the overseas Typhoon programs in which case 10K over 3 years would probably be peanuts!