No, actually not a good example. Bulgarians only pay half the stone for TCs, therefore it's easier for them to get to 5 TCs and maybe a castle, but it's a huge investment for the Sicilian player.Good resent example was the last game between Villese and Viper in RBW3. Viper went this really greedy 5 tc boom. Villese countered this by building an army and just running over Viper. Now imagine Viper had been Sicilians instead of Bulgarians? With 50 serjeants he would've won that or at least delayed Villese enough to build his own army.
If you let them get to that point, you should've pressured probably sooner.
Their unique tech is a problem on closed maps though and 10 Serjeants is too much. I guess, it will get nerfed eventually.