OP -

1. you shouldn't have that many spokes breaking based on what you put for weight and usage.
2. The oem wheels are most likely spoked to lightly for your use. 209 is svelte by American standards but hefty for bike components.
3. The issues as I see them- the design and build of the OEM is leading to unloading of nds spokes. Leads to breaking. The biggest problem is who you are taking them to for repair. They are doing a horrible job and don't understand wheels. This is actually common in the vast majority of bike shops out there. Even if they read a book, took a class, were "certified" by a bike school or OEM - very few people really do understand what's really going on with a wheel system. Most likely they are simply putting a replacement spoke in, tensioning it and truing the wheel and handing it back...meaning you'll be back soon.

To whomever keeps saying that spoke breakage never happens - you don't ride enough. All spokes will eventually fail via fatigue even when they are high quality spokes and the wheels are built correctly. The thing is that the fatigue life for most of the modern spokes that we are using ends up being a lot higher than the life of the rims in most cases. That's the main reason we don't see it as often.