Yes they're worth saving. They're old dirt bikes after all!
LT2 is basically the DT100 before they made the DT100 (if that makes sense). What sized wheels do they have?
The CT1 is basically the AT1 with a different barrel. I love 'em to bits, but I may have an illness - I've got a piston port AT1, a reed AT1 (AT2) and the piston port CT2 pre-70 race bike.
Early (non-reed) ones are more desirable than the reed valve ones, but no hugely so.
They're little old Jap trailbikes, so they're one of those things that has a very limited cult following. A very nice original AT1 with a CT1 barrel and GYT pipe went on Ebay for ~$1000 recently.
If you don't grab them, send me some contact details.