Oil pan and timimh

I suspect the shop is suggesting/recommending that you should replace the timing chain on the 3.6 V6 because of what has to be removed to fix the leak. I saw somewhere that just the timing chain parts cost $900 from GM. Why so expensive, the 3.6 is a dual overhead cam engine and there are 3 chains, sprockets, wear compensators etc. Time to decide if you want to put $2,500 into that car or use the money to trade up.