I can't remember how many times it has been said, and I'm sure it will be said many many times in the future.
"Deleted" means they were deleted, not banned. This is to protect those who have had their accounts stolen for whatever reason.
Once a RMT spam bot is reported, it takes <4 hours or so to be banned. At that point, you can take them off your blist. So, I'd say tomorrow when you log on, it's safe to delete every single one of the people on your b-list (besides players that earned a spot there for being annoying/etc). From then on, just blist RMT spam as you would, then take them off the next morning. That way, it takes only around a minute of your time. Sure, you can complain about it being tedious, but at that point you'd just be being tedious yourself. Please do research on these things before complaining about them. This has been known for a very long time.
So what would the point of enlarging the b-list be? The fit more bots in there because people are too lazy to take them off or maintain it at all?
