i 'm very sure no EA that 'always' profitable. if it guaranteed making 10 pip and no loss, risk behind it is very dangerous. example like martiangle, this EA guranteed you making >50 pip daily and no loss.
just use EA, only after you know how this work. there is any good or supreme EA. but i repeat, it always risk compounded.
it's foolish risking your money on EA,while EA creator not use it or not risking their money with.
i'm sure professional trader will not use EA. if they do that no more just 'playing' with it or just set it on particular time, but their system not EA but themself.
why not just make your own EA with your idea?