I personally would try to keep any saltwater out of the bilge! Exposing everything in the bilge to saltwater is not good. It is a corrosive, which is hard on any wiring connection and it will flat-out turn all those clamps (yes, even stainless steel) to white powder!
It is not just Bayliner and Campion – it can happen with any boat. Scuppers are designed to be above the waterline. The problem starts when putting all that extra weight in the stern. (e.g. extra battery, downriggers, and those kickers) that were not designed to be there. The actual correct answer is move the weight forward (not putting all that weight on the stern), or counter by adding weight in the bow. Keeping those scuppers well above the waterline.
I had the same problem with my Proline with all the extra weight added. At rest the scuppers were right at the waterline – not good. It didn’t take much for water to start coming in and I do mean a LOT of water. I won't recommend to remove or permanently seal those scuppers; however, I would be plugging them. You will also be amazed the amount of rainwater that accumulates when those scuppers are plugged.
What I did was get two “Turn Tite Bailer Plugs.” Plugged the scuppers from the inside to keep water from entering back in. While trolling, anchored, or at rest – plugs went in. While running, especially in rough water, plugs came out! Not the best answer, but works and is better than the alternative indicated in those pictures!
Also, IMHO I would heed this advice:
http://www.yachtsurvey.com/sinking.htm