As a response to a reply I saw, I never claimed to offer "professional writing service" you will not find that in the advertisement. Frankly, I explicitly denied being the best if you read through the ad in its entirety. And yes I will upload some proof of my work. I'll edit a link into my first post for a cryptocurrency blog I write for.

Yes, I also offer proofreading services. .015 BTC/500 words (half the rate due to you doing the majority of the work)

For the record, I do not charge more than what I do because it would be unjust to do so. My writing is not worth more than 20 USD/500 words (.03 BTC @ preev.com). There is nothing wrong here, this is just my rate. I've conducted business on here before. Check my trust rating (not a lot because I'm relatively new). I've satisfied two customers. My rates vary as shown there.