I just did a search on your posts and it would appear that you have received some pretty good responses to your questions. Granted, you didn't get any takers on your sale of the new, unneeded starter, but the rest looked pretty good. If you don't act on the suggestions (check the light codes, for example), you really can't complain.
It would appear that you have accomplished a lot of appearance items on your MB, but now some of the mechanicals are giving you fits. That is unfortunate, but I wouldn't take it out on the guys who spend a lot of their valuable time providing many of us with valuable help on the forum.
Good luck with your car problems. I hope that you eventually get things sorted out and, after a little hindsight on your part, can feel better about the help available on the forum.