Registrar domain squatting--Could this be???

[Njmom]

I have hundreds of domains registered at this certain registrar. I noticed whenever certain domain expires and I do not renew and it is "dropped" the term they use, they actually pick up that domain. The thing is they only give a 15 day renewal period and anytime after if you want to renew you need to pay $80 for restoration. But how is there a true restoration when they keep the domains for themselves? They even go a step farther sending me an email letting me know that they now manage the domain . Is this domain squatting at the registrar level? It seems fishy to me. Instead of them letting the domain go back to registrar or release for anyone to buy or bid on the domain they keep for themselves... Please help as I think this is unethical and unfair.. Help guys!!!!