I wonder does Steve Sansweet collect all these high dollar items (from SS/MR/GG/Attakus), into completion? I don't even think he's that crazy.
We've all done it, and will do it again. Feel no shame, just put more energy into enjoying what you already have/can afford and putting them into nice displays than worrying about what we can't have. There is ALWAYS something you can't have.
Remember, you don't have to be all-or-nothing with entire lines. Maybe with certain types of figures. There's nothing wrong with having Boromir next to a couple of Jedis... RIGHT?