I often found the bell sellers if you gave a polite no thank you in Pamporovo will leave you alone. Agree with you though if they do not leave you be then they could be a annoying - although Pete is right they add a bit of culture to the ski area.
It's all part of the atmosphere, the smell of burning pine and the sound of tinkling bells especially on the first day as you get geared up and everyone is ready for the first run of the year down the mountain com on February