My dealer has been in business since the 70s and sells primarily BMW MC and Piaggio/Vespa Scooter. Their shop rate is $85/hr.
My first service was $212.35. That included replacement of engine oil and hub oil, inspection of air filter, check of steering head for play, safety check (lights, brakes, tire pressure, road check) removal and inspection of spark plug, including gap, throttle play adjustment, and inspection and tightening of fasteners.
Your price was reasonable given the service, but there was no need for them to replace the spark plug.