i think that price is "in line" with the going rate for this.
personal opinion is that's a nice chunk of change.
however it is required/recommended maintanence.
if it runs better and you're happy, have piece of mind and gas in your tank, that's ALL that matters.
there's a lot to say for preventive maintainence
*92 400e 124.034, SOLD
*92 300e 124.030, SOLD