Trisher, I can't believe you haven't had responses as I too am hooked to this programme. Like you say some of the items are bizarre but some so simple that you wonder why no one thought of them before!
There was a similar programme on several months ago - I can't remember what it was called but the 'inventor' had so many minutes (3?) to promote their item and if the audience were interested they lit up lights. If a certain number of lights were lit, more questions (including the price!) could be asked with the opportunity to put your light out if no longer interested. Any lights still on meant sales!
We saw a refillable roll on sun lotion gadget and have since bought some - they are brilliant.
My invention would be a door that, when you come into a changing room after swimming, you could walk through and come out the other side dry and dressed!!! I doubt if that will happen in my lifetime!