No, but if you wind up being afraid to ride it for fear of it being damaged or stolen or something, that could be problematic.

Good equipment is never a waste. If anything, knowing that you aren't limited by your equipment can make you focus on improvement (riding up grades, rather than buying upgrades). If it is a question of limited disposable income (which most of us have as a limit), then figuring out what gives you best bang for the buck is key. (105 is a pretty good cost/benefit trade-off. It pretty much gives you everything the higher-end groups like Ultegra etc would provide, but maybe a few more grams).