Above statements would seem to be correct.
The balance on one of my cards ( well, MY card, as other is actually partner's ), does some odd things overnight.
Balance went from positive $xx_ to negative $xx_, and I then had the next 48 / 49 Coles transactions showing each was a 'minus' figure.
By rights, my account was in default, and those transactions should not have been allowed ...
This seemed to be, because over the weekend, I did X number of lots of '50' transactions, and there was an automated debit to be deducted from the account.
Anyway, I did successfully use both of the cards I have to 'play' with, to get 196 transactions per card, in the one day.
If there appears to be no limit, I wonder if this is actually going to produce the QFF points from BW ??
I've also determined my own 'rules' ( to help lessen the 'issues' that have arisen thus far ):
Only do 98 transactions on a Woolies / Coles Self-Service machine - they tend to 'crash' at 99.
If you do 'crash' a machine, a grey / blue screen appears, which indicated the machine is 're-booting'. This should could take a few minutes, and a receipt may also be triggered. If you get a receipt, you can 'go', and not have to wait for the machine to come back on line ...
Certainly be wary of 'busy' periods. People tend to become 'inpatient' when they are watching you 'play' with the machine they think they are 'entitled' to use ... sometimes, I just do 10 - 20 transactions, then 'go around' again.