It's bedtime in Melbourne, but I write what would be fair to call a well-known tech blog, and very publicly started a consultancy about 1.5 years ago. Pretty much in the same niche you're in. We made enough money to pay two people full -time wages in the first year and I've cracked $1K per hour on some engagements (not many, and each one was <20 hours).

Happy to have a chat if you drop me an email.