I'm sorry, but this is absolutely terrible advice. They'd be better off just asking all the guests to email them all the snapshots they took with their point-and-shoots, because it'll be on par with the quality that they'll get from someone who doesn't know what they're doing. Granted, if the couple couldn't give two craps about photos of them and their wedding, then skimp away; but otherwise, photography is one of the last places that one should look to save money with a wedding. A DSLR doesn't make someone a good photographer, and taking pictures of a wedding doesn't make someone a wedding photographer. Wedding photography is not for the faint-of-heart or the inexperienced, and that's why professionals cost [and are worth] a lot of money.