Sorry about the late response. I have been neglecting this thread.
Being unverified only really matters in the event IF their Paypal gets limited for abuse of policy.If a person is limited, Paypal will refund some (or all) of that person's payments. That's why being limited is so bad.
You can get your Paypal limited for any number of reasons, be your account Verified or Unverified. However, there are a lot more rules to break if you are Unverified; thus, you are putting yourself at more of a risk this way.