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Cost of Polish lessons, courses (private) [34]
I don't think Skype's the best and the most professional tool out there, main drawbacks? It's a p2p technology which means that if you want to tutor anyone who lives a little bit further away from you gonna suffer a delay. The other thing is that you can't take seriously an application that uses your bandwidth if it pleases so - Skype uses tunelling to connect people who are behind NAT. So whatever connection you have, you can still be burdened by other people using yours if you are not behind NAT you're just gonna be a man in the middle for somebody - and jeopardizing students bandwidth without his knowledge, with fee included that's a little bit over the top.
Client - server architecture is much more reliable you can choose a server that is located between you and your student. You can choose a codec depending on the bandwidth both of you have. Good codec allows really good quality of sound. Of course skype is idiot-proof anyone can use it - it's the only plus. It might be used for casual conversation if somebody has got a broad understanding of the subject, but to teach the basics.. I don't think so.
Of course skype is used by some companies, but not for language education, for project meetings and such, these things don't require crystal clear quality.
If someone was serious enough to bill somebody 60zł per lesson, he'd be also serious enough to invest some money into a better technology, set up a server and write a tutorial. On the other hand it's probably a pretty smart thing to do, use a freeware software, and sponge people for a home visit price..