Spread between Exchanges BTCBRL (Foxbit x MercadoBitcoin)

In order to summarize an opportunity that pops up once in a while, I´ve seen that due to a disparity across exchanges (liquidity, fees charged and wallet availability) they´ve must have a perpetual difference in prices, however, no more than 3%, MercadoBitcoin higher than Foxbit. Why?

1) MercadoBitcoin charges 1.99% over deposits in BRL             . Foxbit doesn´t. (+1.99% spread)
2) MercadoBitcoin charges 1.99% over withdraws in BRL             . Foxbit charges 1.39% only. (+0.6% spread)
3) MercadoBitcoin charges 0.3% for passive orders and 0.7% for active order. Foxbit charges 0.25% and 0.5%, respectively. (+0,05% //+0,2%)
Obs: Suppose that you have at least 1 BTC             (MercadoBitcoin only allows deposits and transfers for 1 BTC             ) and that fees paid for miners will be the same.

So, summing them up it means that MercadoBitcoin have +2.8% cost incurred in its price, meaning that if prices have distortions more than +2.8% it signalizes gains for the following trade: Long BTCBRL on MercadoBitcoin // Short BTCBRL on Foxbit.

Any comments/tips are highly appreciated.
Very good Observation. Im currently using Bitcointrade.com.br its seems decent, i like it

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