Liking and loving are two magnificently different fields, so my only advice to you (as somebody who has no business giving advice and has the credibility of a dirt clod posing as a rock) is to follow your original intention as long as you can. What you LOVE defines your collection.
It took me 20+ years to learn this- after spending many, many of them obsessing about collector-minutiae and acquiring pieces not because they inspired any passion, but because collector protocol insisted that "any serious collector must own (X)..." After repeating this process over and over again and winding up with a bunch of crap I totally didn't care about- in spite of making for a "great collection"- I finally learned that collector dogmas aren't for me anymore.
Two decades to finally arrive at a point when I view collecting as a non-competitive affair, something I do for my own personal enjoyment. This means that there will probably come a time when my movie poster collection is adequate for my decor and very rarely (if ever) will I buy another one.
My holy grail?
A poster that would probably be meaningless to everyone else, but would mean a lot to me.
"I Sell Anything" with Pat O'Brien. One of my favorite movies, even though it's been panned by critics and you could probably poll 100 film aficionados and maybe 2 would have ever seen it... and if one comes up, I'll probably want it. And if it has a crease or a stain or a tack hole, I won't care... and if someone outbids me, oh well. Maybe I'll get another one, one day. And if I never get one, no worries! Won't lose any sleep over it.
This go round, I'm collecting for fun and enjoyment, rather than to prove anything to anyone
It's pretty damn liberating
The only thing I am staunch about is originality. I like owning artifacts as a credible, direct line to the era they represent. Repros don't offer that, so I'm going to learn as much about authentication as I can.