Season 5 Crates

[Trenton]

Ok so I heard that every season, better gear comes from the crates, and if you "wanna be good in pvp, you gotta buy the newest gear at every season." They said that the last season's gear turns to crap, and gets really cheap, and you gotta buy the newest stuff. Is this really what happens? If so, I'm not gonna be able to keep up with pvp, as I don't have money failing from the sky upon me. Pls enlighten me, because it sort of scared me.