Not an atari collector FIRST, I do cart only atari for the most part since it has little sentimental value to me, I'm only 20. Besides that though there are some titles of historical significance on atari, Mario bros being one of those. Despite not being huge into atari, Mario bros on any platform makes for a nice display piece.
Edit: I also do own all the main 2600 consoles, jr and 4 switch cib, and a cib 7800. I just don't actively search out and collect atari - besides outliers.