Not allowed to attend TGIF! Oh fie, O rue the day!
I have been a contractor at a certain large outfit I won't mention.
We were excluded from any meeting at which 'confidential company business' might be discussed. This included all weekly staff and departmental meetings, of which there were far too many and all of which went on far too long. So, while the staff were competing with each other for inadequate amounts of brackish oxygen, we contractors were getting lots of lovely work done, pushing our productivity level even higher in comparison to the staff than it was to start with. (And anything we needed to know, they told us after the meeting anyway. Just how we like it.)
This exclusion extended, joyously, to (compulsory for staff) company junkets, pep rallies and the Christmas Party, where 500 spotty, hygiene-deficent nerds would spend hours hitting on 1 girl (who was a lesbian anyway), while we contractors spent lovely evenings at home with Mrs. Contractor, enjoying all those things if it wasn't for which we wouldn't bother working in the first place.
We were also never asked to work overtime. Paid by the hour as we were, it was too expensive. In my case, it would also have required them to renegotiate my contract, which would have been even more expensive. So while the staff were sitting there all night and all weekend for nothing but a pizza, we contractors got to spend our time in our lovely home with our lovely Mrs. Contractor, etc. etc. (see above).
TL;DR? Exec summary :- WLB FTW.