Mistake in your math, the largest reward on the board is 200, not 100, there is also a 200 and a 250,not sure if anything in between.
Your still correct value has greatly reduced and based on screenshot I have seen 100 is more commonly the max, but it's not the true max.
I guess we will have to wait and see how it plays out on a week to week system, based on the screen shot above it would seem that the 100 point tile was substituted with a 300 point one, why that is the case on that board only repeat plays will help to figure out.
Even with that said, it doesn't really move the brackets all that much, assuming 300 points is then the max, but only 1 tile can be over 100? would be very different to any tile potentially being over 100. So if for example there was a chance to get 300 + 200 + 250 + 100, then the mechanism for an extra play would be meaningful. The question will remain, how likely are you to get a tile on your board above 100 points and how many could there be. Having a 1 in 10 chance of there being a 300 point tile on the board diminishes the average value of the tile significantly. You have to both have the tile present on your board as well as having at best a 4 in 20 chance of selecting it on the day at best. Considering that the overall value of a tile being an extra R20 it's not very inspiring.
Now if there was an outside chance of the tile being 1000 points well then that's another story...
I suppose we will have to see what happens. While I understand that this is being spun in a way to benefit the synergized package, it's a bit disingenuous of Discovery to say it's a big positive fro the average client.