Mate your not out of line (or wrong!) at all!! A very,very good freind of mine who recently started spin fishing with me & who was only working part time a few times a week (he likes to travel/back-pack ALOT! so he's only here a few months a year!) did pretty much the same thing.Basically he got fed up of hooking 'expensive' lures to the bottom (due to his lack of experience) and made a lure out an old stainless steel tap which he drilled out filled with some lead and i helped him dress it up with a holo sticker etc..i was a little bit skeptical at 1st...anyway he got a very nice dentex on it (3kg) 1st time out!!! result!!
Then he made a pirk/jig out of an old stainless steel knife (the old heavy kind of cutlery) and same deal..was catching just as much tunnies etc as me with a manafactured lure
in fact there is a pic in the gallery of one of his catches.http://maltafishingforum.com/talk/index.php?action=gallery;sa=view;id=3172
Anyway he has started a 'trend' & few retired guys where i fish have started making their own lures and again the same thing;if the fish are in a biting mood they'll hit them just as well!!
If anyone still doubts,do a google search or on youtube for "beer cap lures"
So to sum up,apparently the fish in any part of the world,can't tell the difference between a manfactured lure & a homemade one!! If the fish are hungry they'll hit anything..and if they aren't they won't!! No matter what expensive or cheap lure you chuck in front of them