I have sports models with hundreds and hundreds of flights over 20 years plus, I always use quality servos and have always coined the phase a quality servo is always a quality servo, budget is fast track to the bin! I have jets that are 10 years old and still on the same servos, OK not a huge amount of flying, but my Classic Flash is on the original servos you see in the manual pictures and that has between 6 and 700 flights, I lost track after 3 changes of Tx in its time and a turbine swap while the original P-120 was serviced. Stevie Roberts CF is around the same number of flights but a younger model, both have original JR servos in.
As I've said before I run in all my new servos and this gives them an easy birth. Brushed motors and load straight away is a recipe for trouble. Check your surfaces, ball-links and clevis for tight spots and servos should last for years in our low vibration installations. I've only really badly damaged one jet in 11 years of flying and that was an elevator servo problem from ground vibration making the surface "buzz" madly on the ground and it killed a pot.

Dw