Are they taking advantage by replacing parts that dont need to be

Yes this thedo need to replace most what they say. where your water pump is located it is highly recomended to replace the timing belt as well. a/c and alternator belt will need to be replace if the show wear or are streached. i am inclosing a diagram of what they have to do to get to the water pump so you have an idea of what they are going to be doing to your vehicle.

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3.5L Engine

1. Disconnect the negative battery cable.
   

1. Place a drain pan under the radiator. Open the radiator drain located at the lower right side of the radiator. Do NOT use pliers to open the plastic drain.
   
2. Remove the coolant pressure bottle cap and open the thermostat bleed valve.
   
3. Remove the timing belt using the recommended procedure. It is good practice to turn the crankshaft until the engine is at TDC No. 1 cylinder, compression stroke (firing position). This aligns all the timing marks and serves as a reference point for all the work that follows.
   
4. Remove the water pump mounting bolts and pump. Discard the O-ring seal.
   
5. Clean the gasket sealing surfaces. Do NOT scratch the aluminum surfaces.
   

1. Install a new O-ring and wet with clean coolant. Be sure to keep the new O-ring free of any oil or grease.
   
2. Install the water pump and O-ring to the engine block.
   
3. Install the retaining bolts and tighten to 105 inch lbs. (12 Nm).
   

Tighten the water pump mounting bolts to 105 inch lbs. (12 Nm)
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1. Rotate the pump and check for freedom of movement.
   
2. Install the timing belt using the recommended procedure. Verify that all valve timing marks align. This is most important. An engine out-of-time will be seriously damaged when first started.
   
3. Be sure that the radiator drain is closed. Open the thermostat bleed valve. Install a 1/4-inch clear hose about 48 inches long to the end of the bleed valve and the other end into a clean container. The intent is to keep coolant off of the drive belt(s).
   
4. Slowly refill the coolant pressure bottle until a steady stream of coolant flows out of the thermostat bleed valve. Gently squeeze the upper radiator hose until all of the air is removed from the system.
   
5. Close the bleed valve and continue to fill up the coolant pressure bottle to the proper level. Install the cap back on the bottle and remove the hose from the bleed valve.
   
6. Reconnect the negative battery cable. Start the engine and allow to run until normal operating temperature is reached.
   
7. Check the cooling system for leaks and correct coolant level. Be sure that the thermostat bleed valve is closed once the cooling system has been bled of any trapped air.
   

Have the shop show you why these parts are bad, if the belts are in good condition there is no need to replace them. they will be removed in the removal of the water pump so labor for taking them off and putting them back on will still be included in the replacement of the pump. check the belts for any signs of wear any cracks across the belt any sign of dry rot.
if you do have the parts replaced and any time you have parts replaced always ask for the old parts this way you can be sure that they did replace the parts they said they were going to. hope this helps some