Out of the box, a high-end motherboard does not offer performance improvements. It may offer additional / newer interfaces, and more ports and/or slots, which increases future-resistance, or it may offer higher overclocking, which can add performance. It should also be built with higher-quality components, which should increase its lifespan (although all but the cheapest boards use all-solid capacitors now).
The Sabertooth has the distinction of offering a five-year warranty, which certainly implies quality and longevity. The much cheaper MSI GD65 Gaming board also uses milspec components though, so it is likely to last as long.
If you build a new rig every year or so, there's probably no need to get a high-dollar board. If you build for longevity though (as I do), you won't regret paying the premium now because it works out to very little when spread over the life of the system.