That can be read in two ways:
1) It's only $100, well worth the money.
2) Surprisingly little value was provide for all that money.
That can be read in two ways:
1) It's only $100, well worth the money.
2) Surprisingly little value was provide for all that money.
I'm not sure how you'd read it the second way.
$100 per month is a lot of money, in that case "wow is that all?" must refer back to how little you got from it.