Buying Dealer Demos

There are great deals to be had by buying speakers that have been used as dealer demos. The upside is the price, as well as the fact that you get the full warranty and support of your local dealer. The downside is if these speakers are used as the dealers main two-channel demo system, they will get usage in one year equivalent to 3 to 4 years in my home. The speakers I am buying are very high quality speakers, and have been driven by excellent electronics. They also sound great! Should I be concerned about the overall lifespan/performance of these speakers?