True.
I happily re-used several of my old-school 'fat mugs' over numerous visits without shame as i knew they were sold to me when the policy was :
'unlimited refills for your stay, and any future visits'.
There was actually signage that said this as well, posted in the Food Courts at that time.
It was one of the major marketing quotes that motivated you to want to buy a mug...and i did for that very reason.
I visited often every year and it would be something that i could use.
Never had a issue bringing it back over the years...actually had people comment on how nice the old mugs were.
i definately got my $11.99's worth out of those 2001 'fatties'....