If the seller wont agree to a mutual cancellation you will have to pay for the items AND the postage or risk 7 unpaid item disputes.
You have no right to expect to be able to pick up, even if you were in the same street.
Many sellers do not want strangers coming to their homes, or suddenly find they have new 'friends' that drop in.
Not saying that this is the case with you, but there are many members that are on ebay for the 'social' aspect.
I have been on the receiving end of an unwanted visitor myself when my step son sold a set of wheels and gave the buyer the address without telling me, I found a stranger in my back yard, and looking in our shed!
And sorry to be blunt but I dont understand why you would be offering friendly advice on others listings, when yours were a mess only a few weeks ago.
You need alot of experience on ebay before you qualify to criticise others listings.
Today might be the day that I get mistaken for some-one important - Hyacinth Bucket