Honestly, 344 people reached is very low. I once run and ad for my photo FB page, I paid about 5$, and it ran for about five days 1$ per day, or sth. like that. And it reached if I remember correctly about 2000 people, I also got much more likes.
That is definetaly weird, either ppl are not interested in your page or sth wnet wrong. As I said, slightly more than 300 people reached for 10$ is very low number.