Typically popular movie titles that you know are 4k run min. are the easiest to know they will go OOS within a 4-6month time frame .... from that point on the demand of the title will determine its value.
a good example of this is "Faster" .. most people havent seen the movie so the demand isnt very high ... but it was 4k and sold out, and its an AWESOME movie and so it'll just keep rising in value. Thing is, if another Country prints a Faster even as a subpar release a lot of collectors are happy just getting the cheaper version. But for now, its going the route of The Town as its the only one, a great movie, and great looking steel.
Comic book movies fetch the most, but they are also the most vulnerable. Because if the movie is successful (and most comic book movies are) then there will be another sequel. So when that new one is coming out 1/2 years down the road you stand a chance that a lazy studio might reprint etc. However, thats where I come in, but I've pulled off enough miracles as of late that there is no way I can keep it up all the time as many studios or reps dont include me in any process. In addition comic book movies these days print much more as their success garners and they share runs so they arent as limited.
The most protected titles are obscure titles with premium finishes, as those studios wont usually take another chance on and if they do they dont pay extra for finishes. Perfect example is Death Race Germany. Its been done again, but never to the point/extremes that it got at release. They arent willing to invest that much back into it again for a reprint.
