SDAH NDLS Duronto: দৌঁড়ে চলো , দিল্লি চলো - PPG

Below is a sample of availability on Mumbai ADI duronto... I was just wondering, why do people book tickets which has W/L of say over 100 or so. I mean, it can't get confirm, at least during summer vacations and that too on popular routes like Mumbai-ADI...
2013-05-07, Tue GNWL119 / WL74 GNWL31 / WL20 GNWL# 2 / WL# 2 GNWL# 126 / WL# 96
2013-05-08, Wed GNWL117 / WL94 GNWL33 / WL18 GNWL# 5 / WL# 5 GNWL# 200 / WL# 145
2013-05-09,...
more...

Thu GNWL215 / WL153 GNWL47 / WL38 GNWL# 6 / WL# 5 GNWL# 252 / WL# 184
2013-05-10, Fri GNWL319 / WL238 GNWL# 98 / WL# 82 GNWL# 13 / WL# 10 GNWL325 / WL299
2013-05-11, Sat GNWL186 / WL124 GNWL56 / WL44 GNWL# 12 / WL# 10 GNWL# 192 / WL# 167
2013-05-12, Sun GNWL151 / WL92 GNWL58 / WL28 GNWL# 5 / WL# 5 GNWL# 146 / WL# 114