What's the customer willing to pay?

I have charged $125K for a weekends private work before now, the customer pulled out his chequebook and didn't even blink. I walked away feeling bad because I could have asked for more...

Every job is judged on it's own merit, complexity, client and location. Some jobs are complex and you don't always earn much, other jobs are simple and you can earn heaps.

What I charge here in Western Europe or in the USA will not apply to you somewhere like Turkey because you would have to adjust for local factors. If you have a monopoly product, then there's no competition and you can charge what you like. If on the other hand, you have someone on the other side of the street that is willing to do the same work for $5/day, then perhaps you should come to an arrangement with them!