Batteries leak all the time - in particular when people leave them in for too long. Just last week:
Another one last year:
So big deal 2 examples over 7 or 8 months? Well I've only done 4 quartz watches in that time, so this is a 50% battery failure rate on my bench...
In my experience the #1 reason for leaked batteries is the watch owner neglecting the watch (not suggesting the OP has done this by the way). Second is just crappy batteries, and Omega usually insists on using Renata (as they are Swiss) and they have a pretty bad reputation with most watchmakers for leaking, at these those that I know who flip a lot of batteries. And yes the installer can also be a problem - not usually watchmakers who know how to properly handle batteries, but the pimply faced kid at the mall kiosk who tears himself away from his phone for 3 minutes to pry open the case back and jam a new battery in with bare fingers, letting dirt into the case at the same time.
Batteries have a seal in them that has a limited life span, and ensuring that the new battery is as new as possible (most good cells now have date codes on them) will go a long way to preventing a leaky battery in a watch. But the owner really needs to get the battery changed as soon as they see the EOL (End Of Life) warning on the watch. So on most Omegas, that's when the watch ticks once every 4 seconds, instead of once every second.
So to the OP - the battery itself is not expensive - I use Maxell personally as I've had very good results with them, and when I buy them in strips of 5 they are a whopping $0.68 each.
I'm not sure what the scope of work is that the shop is charging you for, but when done properly, it's not just pulling the old battery out and putting a new one in, and the job is done. It will typically involve electrical testing of the movement to ensure that the movement is up to specifications, installing a new cell, new case back seal, and pressure testing - this is the minimum work involved. So if you are going to take the advice of others and seek out another place to do this work, just make sure they are doing the equivalent job.
Based on the costs you are stating, if the battery has actually leaked, this often causes enough damage to the movement that the only option is replacement. Note that for many movements, new circuits are no longer available, so if that is damaged the whole movement is replaced. I don't know what watch you have but a Cal. 1538 is about $350 here. Unless this is a diver and they are doing a full reseal (crown, case tube, pushers, HEV, polish) I suspect they are quoting a replacement of the movement. But you should get more detail on what is being done - just telling you "service" and quoting that price doesn't tell you much.
Hope this helps.
Cheers, Al
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