Patriots are expensive, an IRIS-T costs about 350k Euro, SL variant 500k (the air defence system can use both using quite cheap launchers but the base variant has quite limited range when launched from the ground, being an air-to-air missile and all). And they have yet to miss an incoming missile.
The ideal situation is if they can take something down with a Gepard, a burst should cost maybe 100-200 Euro and you usually only need one or two, they’re quite accurate.