I'm not expecting, say, Honda reliability but they are made and used in a pretty tough environment and have been since 1955.
A lot of the motorcycle touring companies that tour India and the Himalayas use Bullets.
To give you an idea of cost, over here a brand new Bullet costs just £3,999 (around $6,000) and a bog standard basic Bonneville is £6,999 (around $10,500).
That's gotta tell you something

And ... no plastic mudguards or side boxes in sight

Then again, Triumphs aren't exempt from being unreliable and from breaking down ...
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