Hmm.
Staff #1 - used number 400 bus.
Staff #2 - train, Mascot station, Q crew bus from QCC to Terminal 3.
Staff #3 - train, Domestic station, didn't mind paying the platform fee.
Staff #4 - car, LT carpark, card didn't work, managed to get in after negotiation with carpark staff. Smooth sailing after that.
Staff #5-500 - don't know, didn't ask. I guess as per #4.
I think the whole problem will largely disappear when the train platform fee disappears, so using the train becomes affordable. That is likely to take at least several years though, as there are four parties involved - employer, SACL, station operator and state govt.
Cheers,
O8