Yes, after that it's just a matter of personal preference. I personally do not collect incomplete sets, I do not have the time, patience or interest for chasing missing cards. I also collect newer stuff, 1950s and up mostly, as older 20s to 40s cards do not interest me. Most incomplete sets are pre 50s. Finally, I hate pinholes in cards, so that's something to think about. All collectors are different.
What you could do if you want to stick to modern cards (post 80s) is buy a cheap set no one cares about (therefore original) and compare its backside to all your future purchases.
T
