I think you can post your pictures from your iPhone online, then print them out. Why use a possible scam operation like FreePrintsNow (the possibly pedophile announcer is a red flag amongst many)?
Only thing I can think of is large format. I run a printing company and we have the ability to make huge prints but never tapped into that market. Not everyone can make 30x60 prints for framing, I should totally do that they probably charge a ton for that.