Depending on where you are at in your Torn career; some eggs are not useful. For sample:
If you are new, white eggs aren’t useful. You have cheap rehab.
if you are old seasoned, yellow eggs aren’t useful. Happiness boost doesn’t help much.
My suggestion is the ability to exchange eggs (minus gold). A 2 to 1 or even 3 to 1 ratio. This would only be player to system not player to player.