just to point out the obvious

$--->exchange($5-$30fee)...$--->BTC(1.5%fee).....BTC--->platform(0.0010fee)......BTC--->buy shares(1.5%fee).....sell shares----------->BTC(1.5%fee).....BTC back to exchange(0.0010fee).....BTC---->$(1.5%fee).......withdraw from exchange($6fee)...= $11-$30, 6%/$, and 0.0020 in BTC

of course you can hold out till, bitcoin rules the day and you never have to go back.