Is floor paint on concrete purely aesthetic or actually functional?
I would have said one reason for painting would be to create a stable surface, but you seem to have that covered by your use of PVA.

The main reasons for painting (that I can think of right now are):


Aesthetics (as you've mentioned), it will tone down the "industrial" nature of concrete flooring and match your colour scheme.
Durability, this covers physical damage such as scuffing etc.
Maintainance, it will be easier to clean up spills etc. from a painted floor and you won't get water stains etc. either.


So you've covered 2 out of the 3 I can think of, though a couple of coats of the appropriate floor paint might be more durable than the PVA. The question then becomes do you need to take care of the 3rd point?