£102m over 8 years is what the English see as a payment for International Players outside of the IRB window. For the WRU, that value is (at present) £54m.
See the difference? It’s stark. Same product to sell (international rugby) but a different price.
Look at what the RFU pay for: http://www.telegraph.co.uk/sport/rugbyunion/international/england/2325851/RFU-and-Premier-Rugby-announce-new-deal.html
Look at what the WRU pay for: http://www.wru.co.uk/eng/news/8688.php
Anybody want to spot the difference? The fact that PRL serves 12 clubs and RRW serves 4 is utterly irrelevant to what the Unions are paying for.