1728 Bitcoin are minted a day right now (next halving in 2020 ), lets say you have 50% mining so ~900 btc a day. Thats ~4.5M at a 5k BTC. Sure you double the

1728 Bitcoin are minted a day right now (next halving in 2020 ), lets say you have 50% mining so ~900 btc a day. Thats ~4.5M at a 5k BTC. Sure you double the transaction confirmation time but the transactions won't be undone. You might have a chance to mine blocks twice as quick after the difficulty adjusts, but still no long term effects.