I fell head over heels in love with Lego's Bionicle series two years ago. A shelf manager for the toys section of a big supermarket near us in Marseille had some sort of brain storm and started selling off all their old stock for between 2€ and 5€. Even the big kits and the most complex characters, ( with technic style structures/mechanisms etc).
We kept going back, day after day, my son and i, saying , ok, we'll just go and get another couple of x,y,z. Each time thinking i was being excessive. But it led to driven visits to flea markets all round the region, buying huge plastic bin bags full of it, all jumbled up with other lego, dirty, in bits, it didn't matter if it was bionicle. We worked out how to make Bohroks without an instruction leaflet, just from pictures in "comic"illustrations. And then i discovered bricklink on the web, oh yes, we got internet about the same time, and watched all the Lego Bionicle sites back film clips and animations, and read the story. And I spent hundreds of €s on second hand stuff stuff through bricklink; chosen by colour and piece, total nightmare of mmmmmmm obsessive collecting.
And I made my own characters, for me, totally not part of the bionicle story, which i love. They are some of my dearest and most original creations.
And my son plays and plays with the series. Last year we bought a couple of the new figures, but we're less enthusiastic; they've paled.
This Xmas my sons biggest present was the dozens of hours i spent tidying his room during which i had tearful nervous breakdown about state of chaos in which he keeps his stuff, and i retrieved all my own "sculptures" to put on shelves in my room.
We bought him a couple of Mars Mission kits aswell ( which aren't bad, like exoforce which has improved too, so looks better than bionicle now!!) but that's it; i've said; if he wants anymore he has to pay for it himself from now on.
Magic though. Ball joints... sigh...