Are you trying to say the rat cages you've purchased from Martin's have solid floors? Because mine sure don't. Only the bottom does.
And, Ive never known a breeder that gave away, or culled babies. I find that horrible. Your point is, the rabbit needs to be taken care of, right? Well of COURSE the rabbit needs to be taken care of. Wire floors are not an excuse to neglect your pet. But in my opinion, wire floors are much better than solid floors. Would I leave a rabbit on purely wire floors with nothing else to walk on? No. But I also wouldn't want a rabbit walking around in their own urine or poop. Even litter boxed trained rabbits leave poops around. They expel them while playing. Ive had rabbits for 15 years. As pets, while breeding and showing, and as free range house bunnies. I would take a wire floor with suitable options for the rabbit, over a purely solid floor (in a cage).
edited to add: Ive also rescued rabbits. I would take them in from free ads, from friends who made poor choices (usually it was friends with younger siblings that got bunnies then couldn't care for them), and any rabbit that was up to be euthanized. Then I re homed them.
I was not trying to bicker, so my apologies if anything I said was misconstrued. I was just trying to present a differing opinion.