From what i can tell, the gralat rate is exactly the same (~20%) so no, youre not getting more money. The only difference is that 1gralat only takes up 1plot of grass, as it did in the past, instead of 9plots of grass. And the news says it was a bug that was fixed? if i recall correctly, back when this started the news said it was to "prevent other players from stealing"? I actually liked it a lot better. I liked seeing 6 black gralats instead of 50 yellows. also it was more convenient to lock/unlock.

eh whatever. so now my farm has 6blacks and 40 blues lol