People keep saying why would you want to?
But as a minor counter argument, why wouldn't you stick with 1 brand.
Three ideas, mostly for beginners.
1) if you caught some bass on your first plastic, say Berkely, you would be excited with Berkeley and maybe want to try their swimbaits, etc.
2) if you stick with 1 brand, the colors are more consistent, and you know what they are. For example, if you tell me a lure's color is 'You Know It' or 'Monkey Butt' you know it's gonna be River2Sea. So theoretically a Berkely pearl white should be the same in stick or paddle tail or lizard.
3) for beginner's, choices are overwhelming. And if you look at Tackle Warehouse's reviews, people will say 'only get Senkos, they outclass the others', and other people will say 'don't bother with Senkos, they're too expensive, get Zooms'. With so many choices, if you like Berkeley, and you want to learn wacky rig, there probably exists a reasonable alternative to Senko by Berkely to start out with.
So why not? It seems like as a beginner, once you start catching fish with a brand, getting other plastics or hard lures from them should be a safer bet in your mind and exciting!