1. How much do you value a UA mile at?
2. I suspect con ed will work.
3. If the signup/spend bonus posts before the credit comes from ConEd (assuming they insist on crediting your CC) your bonus won't get clawed back (though the 1k-3k standard spend points might).
#1 a penny but zero is better
# 2 Don't even remember which card I used ? LOL might have closed that card already. Anyone ever do this and get a check from Con Ed ?
#3 Did anyone ever get the 20 or 25K points .
# 4 How much do they jack up the bill % wise ?