A few years ago, I spent most of my savings on The Lunar Chronicles by Marissa Meyer (Cinder, Scarlet, Cress, Winter, and Stars Above; I didn’t get Fairest), read them all, and loved them…though I didn’t reread them and sold them some time later.
And what was the first series you spent most of your savings on?
The Wellworld series (fantasy) by Jack L. Chalker back in the 1980s. I still have them but little desire to revisit them as so much else that needs reading.
The only other series that has taken me is the Millennium Trilogy by Stieg Larsson, which had me losing sleep to read. Had he lived, I would have followed the series as long as it lasted.