I have wild raspberries growing along the edge of our property. The berries are sweet and flavourful but very, very small compared to the ones from the grocery store. I was wondering if I dug some up, planted them in my garden and fertilize the heck out of them, would I get bigger berries?

Has anyone done this?

I don't have the option of keeping domestics far away from these wild berries as they also grow on my adjacent neighbor's property.

I would try anyway! Plants are fairly cheap.
At Indiana Berry they cost about $3.50 each. Oh you're in Canada. Nevermind!
My family still says the wild raspberry jam I made this year (I used a mixture of reds and blacks) was the best jam I ever made. So even though in the city I grow domestics, i still forage the wilds, blackberries too, but they are not as good. The wild raspberries taste nothing like domestics.The wild mulberries I forage are to die for too. Thye are my favorite. Not that good just eating, OK, but in jam or syrup, wow!