Slabbed Registry Sets,?

To each his own! This proves that there is no right or wrong way of collecting.
In this case, you are talking about apples and oranges, or slab collectors and coin collectors.
I know of people who collect all the slabs without any coins in them at all, and these make a very nice set of slabs, and a lot more sense if you ask me.

I kind of resent the suggestion that, if you aspire to assembling a registry set, that makes you some kind of "not a collector", or that "real" collectors don't have their coins graded, or that it's all just a big ego trip. Last weekend, I registered my Peace dollars and a little over half of them have photos posted. I am glad I did it. The first thing I did was to post the link on this forum. I have almost no conscious interest in the competitive. I think the analogy to "baby pictures" is appropriate. Who would begrudge a new parent from showing off her/his kid?

As it was pointed out above, some people don't have any one to talk to about coins, to show off (again, like baby pictures), etc. I am in this category. I'm proud of my coins and the effort and patience it took me to find them and assemble into a set. I want everyone and anyone who cares to look, see my coins.

Perhaps there's some satisfaction at my set being ranked 35th instead of 36th or whatever, but the main reason is to show off my coins and to symbolize the sense of acheivement (some people call it "pride in acquisition") at having assembled the set.