Would it increase 'performance' or just cause problems? Probably
both. The performance increase may or may not be present when
compared to what you're using now. Problems? You can bet on it.
Mechanical ones mostly. What conductor will you use that will hold up
it's own weight at 480 or 900 + feet? And since there will be 'sag'
no matter what you use, will the end points be high enough to keep
from 'clothes-lining' yourself on the antenna? Certainly not
impossible to put up such an antenna, but not exactly as simple as it
sounds.
- 'Doc

Do it! See what happens.