People will print low res images then either complain about them or badmouth you. Low res images as a standalone package item are a thing of the past IMHO, high res or nothing. Plus few people want low res images.
I include low res images sized for facebook with a watermark along with high res packages.
Incidentally something's up with your website. Looking at your wedding portfolio takes a long time to load (after the time it takes to navigate there). Are you putting high resolution images online? They should be reduced in size for the web.
Also the second wedding shot, the green background one, totally blown out but probably recoverable if you shot RAW and have good software. It's not quite in focus either, or something's going on with it. The portfolio seemed to use a LOT of bandwidth, and for many people it will be slow, they'll abandon your website. Plenty of other photographers out there want to make it easy to see their work.
Suggest you create a critique thread about your website. I don't want to go into it when you haven't asked.