In years past, I noticed that the pick your own cabin price was on average $40-$100 more for a stateroom with an occupancy of two adults. It was worth it to me back then so it was an easy thing to pay a little extra for the exact room we wanted. I think what the premise OP is trying to share is that now the pick your own room option is triple to four times that amount today.
It’s definitely a consideration when booking because the upcharge from lowest fare truly has increased in relation to the listed GTY fare, enough to make people nervous that if they don’t spend that extra cash, they are going to end up with (possibly) a crappy view/location for that category. That $100 pre-C versus ~$400 now, well it does make you think it’s a heavy increased upcharge.
Our last booking, I know that I felt cornered when looking online to cough up even more for a cruise vacation than in the past, on top of knowing the decline of overall service and product quality post-C. I researched other options and went with a TA that got me the room we wanted that thankfully was in their inventory without the upcharge RC was presenting on their website. We all know the upcharge is there and optional but the increase in cost can be notable to someone who pays attention to trends in the industry.
Getting bumped is an extremely rare thing overall but it would make sense as a business RC would bump the cheapest rooms to make room for those who paid more. As others have stated though, I’m not completely convinced though that booking GTY significantly increases your chances of getting bumped without direct proof that’s really what RC is doing.