Gone are the days where IB wins are worth more later in the week - now every win is worth 250 rep points, regardless of when you get it.

Unless you've completed a Nightfall.

I always thought the buff was minor - maybe 10%?

I actually paid attention last night. A win in IB was worth 312 points. That's a nearly 25% buff!

Getting your first character to Rank 5 requires 8500 rep points. (100 + 1200 + 2400 + 2400 + 2400.) With no Nightfall, and no losses, that's 34 straight wins.

With a Nightfall, it drops to 28 wins. (More when you lose, obviously, since you get fewer points for a medallion.)

That's a significant drop!