Igor I only buy sets to build and display. Not really interested in parts unless there's something I really want to build like jurgens backhoe which I built last year.
I get quite excited about flagships every year but I think it's funny that some people love the loader because it has yellow wheels!
There's a lot more too it,I also love Legos designs they look so real life. A lot of mocs look like mocs to me not official.
Very rare case like jurgens models are nice and authentic.