Why did I buy this?

Going in anything that starts at $60-$65 and up:
Marvel Vs. Capcom 2 (Dreamcast) [$59.99]*
Power Stone 2 (Dreamcast) [$99.99]*
Fire Emblem 7 (Game Boy Advance) [$64.99]*
Metal Gear Solid: The Twin Snakes (Gamecube) [$60]*
Phantasy Star Online Episode 1 & 2 Plus (Gamecube) [$99.95]*
Contra: Hard Corps (Genesis) [$85]*
Castlevania: Bloodlines (Genesis, Majesco version) [$86]*
Streets of Rage 3 (Genesis) [$94.95]*
Attack of the Mutant Penguins (Jaguar) [$69.99]*
Breakout 2000 (Jaguar) [$69.99]*
Missile Command 3D (Jaguar) [$59.99]*
Tetris (NES, Tengen version) [$60]
Conker's Bad Fur Day (N64) [about $60]
Phantasy Star (Master System) [$74.99]*
New Adventure Island (Turbografx-16) [$149.99]
R-Type (Turbografx-16) [$69.95]
Splatterhouse (Turbografx-16) [$60]
Fire Emblem: Radiant Dawn (Wii) [$70]*
Super Mario All-Stars (Wii) [about $70-$80]*

Expensive for the system they're on:
Pitfall 2 (2600); I paid about $23 for it which is a bit on the high side for that system :P

Ones I own but didn't pay for but know go for high prices now:
Mario Kart: Double Dash!! w/ bonus disc (Gamecube)*
Mega Man X Collection (Gamecube)*
Timesplitters: Future Perfect (Gamecube)*
Castlevania: Symphony of the Night GH version (Playstation)*
Metroid Prime Trilogy special edition (Wii)*
Xenoblade Chronicles X special edition (Wii U)*

Bit of cheating: special editions from current gen:
Bravely Second (3DS) [about $60]
Fire Emblem: Fates (3DS) [about $80]
Monster Hunter 4 (3DS) [about $60]
Persona Q (3DS) [about $80]
The Legend of Zelda: Majora's Mask 3D (3DS) [about $80]
Dark Souls 3 (Playstation 4) [$129.99]
Doom (Playstation 4) [$119.99]
Overwatch (Playstation 4) [$129.99]
Final Fantasy 15 (Playstation 4) [$89.99]
Resident Evil 7 Deluxe Edition (Playstation 4) [$89.99]
Superdimension Neptune VS Sega Hard Girls (Vita) [$64.99]
Valkyrie Drive (Vita) [£79.98]
Tokyo Mirage Sessions #FE (Wii U) [$79.99]
Halo Wars 2 Ultimate Edition (Xbox One) [$89.99]
Legend of Zelda: Breath of the Wild (Switch) [$99.99] (Hey I have it preordered :) )

* denotes that it's 100% CIB (meaning jewelcase + manual for TG16 doesn't count)