Plagiarism is not cool. And I mean no insult, but honestly, if you're website is ripping off articles from others, your website is probably not even worth visiting.
Aside from that, your rate is ludicrous. It pains me to see people so willing to extort other like this, and pains me even more to see that there are people who don't value their time enough to consider doing this for you.
If your site was worth any salt, you'd be creating your own original content, or maybe hire people to create original content for you. And at a fair and ethical rate.
And if your excuse is "I don't have money to do that" or "I don't have enough time", then I really think you have to re-evaluate what blogging is all about.
This isn't some sort of back alley temp agency. This is a forum for people who wish to transact legitimate business with bitcoins, and I'm afraid, real world ethics apply here.
I completely agree. There are so many content writers out there who do articles for crazy cheap and are designed for SEO. e.g Natasha Nixon
http://www.natashanixon.com/
I personally use that site for niche sites and the delivery is within 24 hours and for a 400 word article, it's only $6, she also does discounts if you contact her personally for bulk orders.
Seriously, this is not a good way to SEO your site. Thumbs down.