What's more likely is that a lot of people set their limit sell orders to 200, because the number is easy to come up with and easy to type.
If you look at any "real" market, prices rarely adhere to nice round sticking points, because people are at least trying to second guess what the other guys are doing, rather than just acting as though they're the sole person in the market.
"real" markets also have computers and algorithms behind alot of what they are doing. Bitcoin does as well.
I'm sure hitting 200 was either someone setting buy/sells at a point of pride because they wanted too, or a coincidence, or people who don't care because they are long-haul investing.