Nothing has been changed in Rune Temple regarding this. The law of averages dictates that you will have streaks that cost more and less, but overall its going to even out. 2.5 was cheap so you may have had a lucky streak.
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lol my lucky streak lasted for about 2 billion coins...oh well I can deal with 3.2, not the end of the world :D
As I have started getting in more coins now I average about 1 fragment per 5 mill coins spend about 10 - 15 mill a day
Sometimes I get two next to one another maybe 2 next to one another every 25-30 million coins for me
I do runes about once per week (usually mondays) and run through about 150-200 mil coins. before the latest patch I avereraged one frag for ever 2.5 mil coins, (once I had 9 frags in under 2 mil), now post-patch I average a frag every 3.2. perhaps my luck just ran out...but either way significantly less than what you're reporting.