My guess is this thing is going to outlive you.

The 316L denotes the specific kind of stainless steel used. 316L has molybdenum in it and has enhanced resistance to corrosion from chloride and acids (very important when many municipalities add chlorine to the water during treatment).

The most common stainless steel finish, 304, isn't as long-lasting as 316 and hence why you still see rust on stainless steel over time. All stainless steel isn't created the same.

ETA: The type of steel can also go towards explaining the high cost of this razor too, as the increased nickel and molybdenum content makes 316 steel 40% more expensive than plain old 304 steel.