I think to spend that much time at one place of employment illustrates a dire lack of appreciation that we only get one shot at living, it’s a big world and there are a lot of more interesting ways to spend the most valuable years of your life. I could be wrong, but I’d hate to find out the hard way.

Abso-bloody-lutely. +1000

EDIT: Although I’d have phrased it a bit more sensitively.

At 10 years I got a paperweight and a nice pen , at 15 years I’ll get an extra 5 days annual leave which will save me having to buy them via a wage deduction.

I think it’s quite important for an employer to show they value long term employees.