Jean,
I completely understand this. Not everyone enjoys dining with a large group of people. You rarely go to a four star restaurant and expect to be seated with six other people. There's nothing wrong with people not wanting to be social at dinner. I know the number of tables for two is far less than the demand.
Many people go on a cruise for a romantic time with each other and want that time. My wife and I have taken a couple of these cruises and had a table for two and enjoyed it. Those cruises were our time together and we greatly enjoyed it. After 22 years we haven't ran out of things to talk about.
Take care,
Mike