Agreed! That is just completely inappropriate.
If I had received an invitation like that I would call up the bride and groom, and tell them I would not be attending and it was because of the rude invitation I was sent. I would tell them it wasn't my job to pay for the wedding and if they couldn't afford the wedding they wanted, they should wait until they could, or cut back on some of the frills.
Then I would wish the couple all the happiness in the world and hang up.
That's just not cool. I hope this person does not attend this wedding.