I have been a mechanic by trade, for over forty years, motorcycle, cars, heavey truck, etc. I have the tools and the skills to maintain virtually anything, but I try to support my LBS as much as possible. I'm older now with six grandchildren, and letting the LBS maintain my bike gives me more time for the important things in life, like riding with my grandchildren. It is also nice when I need a part or accessory, to let LBS chase it down for me. The $2 or so more I pay, is well worth it to me in time saved.
For those of you who still enjoy puttering with your bike, do it, everyone needs a diversion or two.
John