It sounds like you don't like these people. So throw the card in the trash, don't send a gift, and move on with your life. Assuming good intentions would likely have you some angst as well.
+1
Even though they didn't spend the industry average of $30k, you instead are judgmental that they may have spent $300 on professional photos to remember an exceedingly special day? (The cost of mailing announcements is very low in the grand scheme of things, probably less than $100.) That's taking mustachianism - and judgement levels - too far for me.
I see where you’re coming from but they literally can’t pay their bills. For them, I think the professional photos are over the top. They can remember this day with regular photos. [/color]
EXCEPT, despite your consternation-condemnation-frustration over their audacity and apparently really poor money habits - they somehow managed to have professional photos taken at their wedding. (which could well have been taken by someone they knew as a gift to them or they got a $99 special)
Just let it go - you don't appear to like them and sound offended by their very existence.
As weddings go - this is indeed a very modest one, so give them credit for that - even if you personally feel that they should have done zero. Zero is a bit harsh and unrealistic even in the MMM world.
They showed restraint in spending and good manners by honoring you with the information about their change in status and address.
If you are so hopelessly out of touch and anti-social on purpose that you don't recognize good manners when you see them, I'd say you might want to re-examine your own perception and the reason why you cling to such a negative view of their actions.
We are just strangers on the Internet so we don't know possibly hurtful details or outrageous actions this couple may have engaged in the past - but people do make a lot of stupid money mistakes when they are young - give them the benefit of the doubt, maybe they are on the way to mustache land:)
One never knows:)