Not at all. The very article linked above says, "India -- $1,000 for virgin, $1-$4 for adult."

He's not, though I don't agree with him (think it's a him?). Yes, experienced prostitutes can and do charge more. but there is a parallel traffic in vulnerable prostitutes, for whom their pimps charge more because they are young or less willing/able to stand up for themselves.

I'm in favor of legalization, but there is some economic research suggesting that at least in the short term, expansion of the market for prostitution (through decriminalization or legalization) results in a net increase in illegal trafficking, because market sector growth >> the substitution effect (whereby many customers prefer the legal alternative). It's not the simple 'ban it or legalize it' dichotomy that advocates on both sides suggest.