water collects runs off asphalt or concrete for that matter.. water
under asphalt heaves it when it freezes since water expands water
flowing under it washes out the underlying base.

the only way to have a nice asphalt driveway is a good base. after 10
years the underlying soil is most likely done settling.

if you do the 700 buck job you WILL be doing it again. worse removing a
doble thick driveway will cost more for digging and removal.

a good friend tried what your considering. 2 years after the 2nd paving
he had to get it all ripped up and done over, removal cost a lot more.

its your $ so I have ZIP in it one way or the other but have had
asphalt troubles

Did you know the top smooth coat has less strength than the underlying
base coat? thanks to the bigger rocks in the base?

when you lay one on top of another with a 3 or 4 inch settling and
cracks the new driveway will crack and have those same setting areas
within a few short years.

the highway dept mills off topcoats for that reason when repaving most
roads

feel free to come back in a couple years to report....