I am an inveterate type collector and have been for a while. My main focus is not really apropos here (a run of Topps types sold at retail from 49-80, sports and non sports alike) but I have partially started T and E card runs as well. My main focus is T206 in almost full set form but I really like going after the different types.
I once was going to do a full ACC and beyond type run but that would be impossible. I did create a huge spreadsheet for that purpose that is still floating around the internet (
www.oldbaseball.com has a copy) and which I someday hope to really get into shape but I have too many projects going right now.
I just like the idea of all the variety inherent in the method, plus with the Topps stuff I want to document everything as well.