If when you last called there were 800 a/c there and there was now 600 listed it is worth making a call.
...and that is why it has been removed IMO...it was an easy way to see when to make the call !
When the number dropped significantly in an instant then that meant a market update had happened, as the reduction was a/c being taken off the market at the same time new ones were added....an sure sign to call the market.
If everyone had figured that then we would all just end up F5'ing again until that drop happened and then make that call straight away...all at the same time !!
Now its fair on all, including those who have not got time to monitor the market, and it totally stops any point in anybody refreshing the market over and over again - the reason the call button was brought in originally.
The only thing I will say is maybe 7 calls per week is not enough...possibly 10,12 of 14 calls would give greater chance of success snagging a decent used a/c and still limit us accordingly.