FoldApp seems to just be subsidizing purchases with VC money for adoption. It doesn't seem to be going well.
See also: Flooz, of which 20% of their transactions were fraudulent: https://en.wikipedia.org/wiki/Flooz.com
I do agree, though, that those very high discounts should be a red flag, if they're for any serious money. Stuff for $5 with a 50% discount is no big deal if someone just wants ot be rid of a card and doesn't mind losing a couple bux, which they'd end up paying in fees buying BTC anyway.
Obviously this is no proof that fraud is rampant, but I still lean toward thinking fraud is too likely for me to want to be involved with using purse.io, especially if I wanted a good deal (big discount = more likely it's a carder cashing out a stolen card.) If nothing else these stories show there's a small chance you might get burned pretty badly. Has anything significantly changed to remove or lessen the risk?
[1] https://www.reddit.com/r/Bitcoin/comments/2po40d/since_my_ho... [2] https://www.reddit.com/r/Bitcoin/comments/2eqcnv/do_not_purc...