Ask HN: How much to ask for consultancy on-the-side?
I'm making plenty on my regular gig, and I don't really need something extra, but it might be a nice entry into a different (even better paid?) way of working. I have done something slightly similar a while ago, and then I charged my usual rate (€70/hour), which turned out to be way too little; even for a few hours, it's still a lot of hassle, and ending up with an extra €150 is just not financially interesting. Besides, because I already have a full-time gig, it's basically overtime for me, isn't it?
So should I ask double my usual rate? 1.5 times my rate? More? Less? Way more? I really have no idea.
Also: what do I say to justify this higher rate to the client?
This is in Netherland, in case it matters.