there are different mining rigs. LTC minimum unit is M , 1 share means 1 M, and BTC minimum is T , which means Terahash. Now pow88 only provide btc A7 miners and Zec hash exchanges , so they are also your first choice . Other miners are still available.
The loan function is not turn off, sorry for that.
and was Your give away time ended ? still hasn't received any Hash Power in my account