I have never needed any support from the LBS. The one time I went to them with a mechanical issue that I didn't think I could handle, they couldn't handle it either so I went home and found that I could handle it.

The markup is honestly pretty ridiculous. They have stuff marked up to 50% over suggested list price in many cases, which is double or more online prices.

I go there if I absolutely need something today. Otherwise I'm going online. Honestly, I don't even think I'll buy my bikes locally anymore. The only time I need something TODAY is if I'm on the road and something bad happens like I blow out the sidewall of a tire, though then I'm more likely to call for a ride. This has only happened to me once. The only thing I've bought from the LBS in the last 2 years has been a couple of tubes last week, because my family was going on a trip where bikes were mandatory equipment and I didn't have any spare tubes to send them off with.