A few cruises back, I witnessed a large family reserve 2 (two) loungers per person - one in the sun and one in the shade. When they were in the sun, if someone asked nearby cruisers about the shady lounges, they would reply, "Those are ours!"
Eventually, someone got a staff member who had a discussion with to the entitled folks and stopped this for a while. The only part I was able to hear was that they were on vacation and had paid for these loungers.
Personally, I prefer a quieter, less busy and less dramatic environment with an ocean view.
Cheers.