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Wait listed tickets are issued on a particular logic which is as follows
On some popular routes, high wait-list numbers in the hundreds are not unusual, and holders of such tickets may still end up with reserved accommodation by the day of the journey since there is a lot of flux as people cancel and re-arrange their trips.
For many trains it...
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is not unusual to see high numbers for the waitlist positions, such as in the 300s. For some trains, this is still reasonable because the trains typically see a lot of cancellation and re-booking activity in the days just before the journey. For some other trains, the high numbers on the wait list indicating that such requests for reservations are still being accepted may simply mean that the zonal railway is planning to run an additional trains as specials to clear the rush later. When the maximum wait list number defined for a train is reached for a particular day's journey, the reservation system refuses to accept any more requests for that day. In such cases, this is shown as 'REGRET' in the reservation status.
Thats why some trains having huge wait list and apart form that passengers get confirmed status after chart preparation
while in some trains a small wait list is not guaranteed of confirmation