I also love the Bounce era demos, they could make a great album!

Instead of the record company veto, I think there is one other reason they didn't make the final album cut: Some of them are similar to other songs, giving some examples,

Standing vs Dig In - Lenny Kravitz
Another Reason To Believe vs Doo Doo Doo Doo (Heartbreaker) - The Rolling Stones (verses)
(taken from Supersonic's thread)

Do you think this could be a reason? Besides this era's demos, other "too inspired by already published" songs had the same destiny, check Put the boy back in cowboy (Fat bottomed girls)...