PS1 and PS2 games pricing - Amazon

This is more of a random type thought.

I have a decent collection of PS1 and PS2 games that collect dust. I was looking on Amazon's site to see what some of them would trade in for. No big surprise, but the PS1 games have a higher trade in value, due to age. Most of my games would fetch 2-4 bucks. But, two games I know I have (and in good condition) had much higher trade in values than expected.

Ogre Battle - 16.50
Suikoden II - 30.00!!!!

Then I looked and if you want to buy a New copy of Suikoden it will run for $400. And a used one is running for around $140!

it amazes me how the value can change so much. I bet I even have some old SNES games at my parents house hiding in a closet. lol.

I'm never going to play Ogre Battle or Suikoden II again. So, do I just do the easy trade in with Amazon and get the 46.50 or try my luck at selling them for more?

Is it easier to do it via amazon or e-bay? I've never sold anything on e-bay before.