I think its the same scenario as we have had in the past really, with EMI's, CD's, Mini Disc & now digital formats........all great for personal use or for swapping sounds with people, brilliant for the radio too, but playing out should be from the original format, in the case of unissued material, so long as the correct people have given the ok, whoever they may be, cut it onto what you like to play.
Also prices of records these day's is reasonably relative, back in the day when 'Frank' was DJing, you guys spent a fortune compared with your weekly wage.......mere mortals could never ever really push to these kinda prices, tenacity, luck & good taste hopefully help.......but not much else has changed other than, the scene/collecting is not just predominantly for the working classes anymore, so maybe slightly more disposal income ???.
Russ