    Sentence 1: But is the Internet so. miraculous an  advertising vehicle that Gross will be able to siphon off  $400 per person from total ad spending of $7,000 per  family--or persuade advertisers to spend an additional  $400 to reach each of his customers?    Sentence 2: Was the internet so great at advertising that  Gross would pay $400 per person per ad, totalling  spending $1000 per family or persuade adversisers to  shell out an extra $400 to reach each customer?