The sports gels and chews are definitely not cheap, but they are good for a few reasons -- they don't go bad in hot weather, are easy to carry and quick to ingest, and they are formulated to get into your bloodstream quickly. Even if you mostly rely on real foods, it can be helpful to have a few packets of Gu (or something similar) for times when you are really bonking and you need energy fast.
Make sure you drink some water with the gels and stuff that you try. If you decide that you like them, you might be able to find them at a better price by buying in bulk online.

