The cheaper calls are that cheap. lol I have calls that are $5 to $125, the materials are different some made of better hard woods, but most of them are acrylic, they dont freeze up, you can blow throw them with all you got and 99.9% won't lock up.
I was using a hydels dr-85 great call, but then I bought a cutt down acrylic $70 from gander mountain and love it, so then I bought a foiles timber rattler and love that one too, its good for open water and close in, what ever you need it for.
I believe that if you spend $300 to $1200 on a gun, the best decoys,waders,and shots shells you should also buy the best calls you can afford. Now don't get me wrong I have every call glynn scobey make and I use them, I just think the acrylic calls sound great.
Just my two cents.