I've seen on the achievement boards where some people help each other get their 250k Shop Till achievement by selling junk items in their shops to each other. Could this be considered actual cheating if someone something like that for the Billionaire achievement? Thanks :)

I'm pretty sure it's not cheating, but if I recall correctly if something goes wrong like the user taking your money and running, I don't think staff will give your money back. You might want to file a ticket just in case

Okay, I'll keep that in mind. I'm not sure if I want to do it, but I'll file a ticket beforehand... and make sure the other person is someone I know IRL so I could yell bloody murder at them if they decided to keep the sP. :P