Marketing exercise? My SPD pedals are cheaper than a set decent of spiked flats. My MT94s cost half what my Scarpas do. Both items cost less than Saint pedals and 5Ten Freeriders respectively. I've used 5Ten shoes for touring, they sucked in rough terrain when walking, I fell on my arse all the time because they have no tread. So you actually need a second pair of shoes, unlike the MT94s which do everything very well.
I would never tour in trainers. Walking over rough terrain in them is asking for trouble with your ankles in the long term.
So I have a very specific recommendation to anybody looking at pedals for touring. Get some M324s or A530 pedals. Get some XM9 boots or XM7 shoes (or MT94/MT71 if you can find them in your size). If you're scared of clipless for some reason, get some Click'r T400s.