"sorry for crappy English"
Seems like you have a pretty good grasp of the basics haha. On a slightly more serious note, well done for placing a value on yourself and your time. As Dr Phil (American TV show host) apparently said "We teach people how to treat us". In other words, if we let them get away with bad behavior, then why would they change - they will continue to treat us in that manner. So I hope your new attitude towards your clients and the value of your time continues to bring positive results.
(And no - I don't watch Dr Phil, or hardly any tv at all, what a timewaster.)