Why is leverage disabled in my account?

Currently leverage is only enabled for the currency pairs XBT/EUR, XBT/USD, ETH/XBT, ETH/USD, ETH/EUR, ETC/XBT, ETC/ETH, ETC/USD, ETC/EUR, REP/XBT, REP/ETH, REP/EUR, XMR/EUR, XMR/USD, XMR/XBT (note that the EUR pairs are not available in the US states of NH, TX and WA). Margin trading is available to Tier 1 - 4 clients (Tier 0 clients need to verify their accounts to a higher tier).