experiences flying into China on a one-way ticket

What have been your experiences flying into China on a one-way ticket.

I get repeated warnings of needing a return ticket or proof of onward travel from the airlines.

The truth is, I just want to go to China one-way and travel around (get visa extentions for a couple months or so) and then leave the country to "wherever" at a later date.

I don't want to buy a return ticket, knowing I won't ever come back.

I also don't see the need in wasting money on onward travel that I don't intend to actually do.

What happened to you when you flew to China one-way? Did you ignore these ridicilious warnings? Did they try to stop you on a one-way? How did you get out of it stress-free?