Well, actually, I have a mistake Baliton that is aquos, and it changes to aquos and pyrus. But still you are wrong. Not ALL of them reverse their attribute.
Sadly enough thats not a mistake... The Aquos Baliton is actually supposed to change to Aquos for some stupid reason or another. Thats why I much prefer the one in the Bakusphere, changes to Haos and Sub-Terra. There is one small use for the other Aquos Baliton though. You can make it so that you purposely lose on your card without having to change attributes (since you can change to Aquos again) then bring out the Baliton ability Card. I dunno, something to think about I may implement it one day
No, its so you can play a trap, and stay your attribute, so then you can get an added bonuis from some abilities and gates, such as heavy water, etc.
Never thought of that part, but thats a good point. Heavy Water would give 160, although the Baliton ability is a really good way to use this too.