The sets that made me give up only buying 1 and going for multiples instead

 I think the tipping point for me being out of control buying legos came with micro wheel creator set. 

I loved the yellow micro wheels set.  The amount of tires, multiple pieces in 1 color and idea book was fantastic.  Imstill worry im on video looking suspicious as I had the longest internal debate about should I or should I not buy all 10 sets left on the shelf.

The star wars minis sets were neat too and I bought multiples

I love the gray and yellow pieces, they can be in the yellow castle or classic space theme!  I really enjoyed the at st models due to the cool amount of small and gray detailed pieces.