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Is running shoes a good investment? Could you guys help me on this? - exterior part of foot pain

I'm on a tight budget this month, but I need my hands on two things that are new cell phone and a new pair of running shoes. My previous phone was stolen, but luckily my father was kind enough to lend me his but I feel obliged to return the phone one day for him. In addition, my sneakers will start taking its toll on my forefoot. I recently met regularly and hurt my bow after the race and after examining my shoes, I discovered that although the outside of the shoe was as strong as when I bought, but the models are thin. Yesterday I was at a shoe store and the salesman tell me about these shoes that my feet have really (Movement Control), judging by how my current running shoes signs of wear, but, unfortunately, are too expensive (sigh!). They were really comfortable and after surfing the Internet by the motion control shoes are exactly what I needed, but is there a reason that on a running shoe which is issued approximately $ 100 cost? Well, I thought, "Hey, before they invented shoes people who still miles aboves only with regular running shoes "