Hi Saket
There are collectors I know who are fans of LP or RD or SJ. These guys are fans of a music director and they will do whatever it takes to have every possible record released of their favourite music director. These are the guys who pay this kind of money for obscure titles. A SJ fan will not bother about RD titles and vice versa. The lps you have mentioned in the above post are targeted at these collectors, not you and me.
Do the collectors also listen to records?