I buy what I like and I buy multiples of various army builders or for customising. I don't buy anything I think is junk. With the exeption of bargains where i'll buy a figure I hate just for the accessory but only if it's a real bargain. I buy most but not all vehicle releases though and sometimes multiples if they're cool and it would look silly just to have one. I buy from all the lines bar the roleplaying, 12" and action fleet lines. I had an action fleet obsession once but cured myself of it by smoking around the toys and having them all go brown. Couldn't be arsed to replace them and so my obsession died.
Completism in what sense though? I see my collection as near complete because I've bought everything i wanted to. It might not be a complete collection of everything hasbro spewed out over the years but it's my complete collection. So in that sense i am a completist because I've completed up to this point. It's a many sided prism to look through really and totally subjective as a question. :happy: