Motorcycle Service is an important part of any Triumph Dealer's revenue, but even in today's economy maintaining qualified Triumph mechanics is a challenge. Despite Triumph's sales successes over the years, the volume still isn't what a mechanic would experience in a Harley or Japanese Shop.
It hasn't been a factor with any Triumph Dealer that has worked on any of my previous bikes, but it also doesn't bother me to not come back for a bike for an extended period - and I usually softly remind them that all I want to do is "just ride it".
One of my former sportscars, an F-Body Camaro, was a true lemon. I put over 120,000 miles on it and loved every minute of it, but the vehicle did spend an impressive amount of time in Chevy Shops
My former Triumph Daytona900 was the same, but I didn't have a local dealer to drop it off at. A couple local non-Triumph shops offered to take ownership of whatever I needed, but their long-term goal was to eventually get me into one of their in-house brands. This example may not be similar for everyone, but shared to suggest that you consider finding out what motivates your local dealer - that may also help improve your level of service, even when the mechanics aren't experienced. Motorcycle Dealers make their highest profit from customers within their city, more distant customers are still good business but there is less chance of building a good relationship.
Hope this helps,