Just a little heads up, offering something free for a limited time and then charging for it is a dick move and is bound to make you some enemies around the forum. If not that it is a little messed up on a moral standpoint. I know most asking are relative forum noobs leaching for free stuff, but considering you never mentioned they would be limited download time and that you would eventually start charging people for said samples if they didn't get them in time it seems a little messed up.
Just my opinion and $0.02. Feel free to tell me to fuck off.