To answer your question, in today's mining situation, the outlook for GPU mining is not so good. All miners from recently released ASICs will rush into mining Equihash coins, out of which BTCZ is the most profitable.

But again the liquidity is so low in BTCz you cannot purchase a lot. For example right now on TradeSatoshi a 1BTC market buy order ($7000 in USD) will push tbe price of BTCz to 62 Satoshis. This is why this is a sleeping giant, when a small whale comes in, it will explode in price. The current marketcap is a joke for a community driven coin with so much dev time and mining hashpower inevsted in it. Look at EOS for example with a semisecret team, shady business who doesnt want to register as security in the USA who knows why, and very little development and massive marketing budget and paid actors on YouTube it has a market cap of 1500x times BTCz with less development done on it and no mining power backing its network.