hello,
i am a freelancer translator myself and i understand your idea, so here is what i think:
the highest i get paid at the moment is $0.045/word and the text is most of the time *NOT* very easy and the quality is usually very important :)
so you might be struggling to find many clients with such expectations.
nevertheless, 10% sounds fair - that's what the deduct here on this website anyway.
who knows, maybe i could help you out here and then if i have too much workload... if this would help you to get more work. send me your email and i might reply.
but to be honest, on this platform you have to negotiate a lot to even get paid 50% of the rate you are after.
just a friendly comment.
cheers,
layer1gfx