We're almost a month after the game's release, you would think that most people did the Companions Questline. It's not a week after release anymore.
Uh well that's a pretty bad assumption. Not everyone can spend over 100 hours on the game already, and there's plenty of other quest lines to do. As a Mage I have no reason to do the companions, at least not right away.
On topic: horses are alright. They speed up fast travel so you don't lose as much in-game time. They are also amazing climbers. On the other hand, they are crazy and it's a pain to mount/dismount if you're looking for materials or get attacked by anything.
Only 1000G, might as well try.