Making a point about it would be what you just did.They sort of have a point. I have to admit, $245 seems steep to me. That's why I do my own oil changes (and for that price will do yours also, bring it on over!).
On the flip side, the $400.00 the GM dealer wanted to replace the turn signal switch on my wife's 98 Corvette seemed equally stupid, so I did the work myself. Took me maybe half an hour.
Unfortunately I seem to be the only mechanic I can afford!