my own 500 smokes a little on tick over when hot,or on the sidestand,nothing on start up,so I am not bothered,
I had the head and valves out about 10k miles ago and replaced all the stem seals,but I guess they were not to good quality,
as for starting it weekly during the winter,I personally would not,unless you can run the moter on a dyno to get it good and hot,you
will promote corrosion ,in the motor,and those very expensive exhaust pipes,
unless its stored in a damp enviroment,the motor should be ok,