Yes, I'm furious as well. I don't know about anyone else but my MP sales have been completely wiped out since these Linden Lab discounts went live.
I'm a very small seller but I have a couple of L$10 items that sell consistently. One of them is a Xmas tree so obviously that has been selling well in the past month.
Then on 26 Nov my sales stopped dead. You have to go back to Nov 2 to find a day before then when I sold nothing so as I said I've been selling consistently at a low level. I made two sales on Nov 25 but since then nothing at all. My sales have fallen off a cliff.
At first I didn't realize why. I thought it must have something to do with Thanksgiving (I'm British, I don't understand these things, lol) but I'm on my third day now with zero sales. And yesterday I noticed my alt had received an email promoting "sales" on the marketplace from select sellers.
Am I angry with Linden Labs? You bet.
I had considered going premium. I won't now as this just isn't fair.
I've never been here on SL to make money but I love to create things and it's so much more fun if I can sell a little of what I make. I even received my first MP review a few weeks ago. It was in German, so I couldn't understand it, lol, but it was four stars so I was chuffed.
There are lots and lots of people on SL like me who are just here to have fun creating. Surely we are what SL is all about, not those big sellers. So wake up LL and get your priorities right please.