Buddy, i do understand that there r few films which deserve to b aired more often in prime slots on Star/disney hindi movie chs and i am sure this issue will b sorted soon.
Most of the retro films or even some newer films fetch less viewership thus airing these on flagship chs leads to decline in ratings. Flsgships chs need to maintain high ratings in order to get good ad slot rates thus they air mostly films which will help achieve this target. This helps maintain balance between investment incurred in buying popular new or old films & getting desired revenue
YRF classic films which u mentioned were aired few times on Star Gold 2 & therafter on UTV Movies too & still they r occasionally aired on utv movies or star utsav movies in prime slots. Very Soon i am expecting star/disney to launch Star Gold Romance (inplace of UTV Movies) , Star Gold Family (Star Utsav Movies) & most probably a new classic bollywood movie channel. Before this content strategy will b reworked & implemented as the chs launch. You will see all sidelined movies being aired on them.
You can take example of Zee Action, Zee Classic for this. Both these chs operate on a different revenue model/strategy and there is little pressure to achieve high ratings. Films aired on these r usually ones which r acquired at less price & thus even if channel manages to get average ratings still return to investment remains good.
About Rab Ne Bana Di Jodi airing on Star Utsav Movies, there could b 2 reasons for it. Star/disney knows that Sony aired this movie lot many times before expiry & thus there would b lesser interest to watch it at this moment. Airing it on star utsav movies gives 2 advantages - firstly, movie will get viewership from both pay and Free Dish platforms thus managing to get highest rating possible, also SUM has good ratings overall which will attract good ad slot rates and secondly this film has more rural appeal thus premiering it 1st on star utsav movies gets the channel further strengthen foothold in this segment by being the 1st to premiere renewed movies on its FTA audience focused channel which is not possible for a new bollywood movie premiere