I have to say looking at the jigs you have linked to, I am surprised anyone would want to spend 50 quid on a piece of kit you could nock up in your shop for under a fiver (including a dedicated clamp)
Am I missing something or are we all getting too reliant on expensive pieces of tat, where do you think the Pocket hole jig came from, sure in wood they wear out from time to time but for another 60p you can soon rectify that.
I hear what your saying but maybe I didn't make myself clear, I have been using a shop made pocket hole jig for more years than I care to remember and it works as well as I could ever want it to. Granted the guide needs to be replaced on occasions but not too often and for a cost of pennies.
I think perhaps people just have too much spare cash or have become lazy. For example a worktop jointing Jig costs between 100 and 300 pounds and has a production material cost of under a fiver.
Where do you think the manufacturers get the ideas from? In nearly every case it comes from the trade and in some instances they barely if at all improve on the original idea.
Don't get me wrong I love machines and gadgets as much as the next person it's just sometimes the money burns a hole in our pockets, so we have to buy buy buy but do we really need to spend fifty quid to pop a couple of holes in the side of a plank.