Ours does have signs up claiming that the goods for sale are for the buyer's use only and they will take all possible steps to stop the selling on of them.
The thing is, I doubt very much that they have any legal backing to this claim.
If the person is selling them on
eBay and earning a profit which they then aren't declaring for tax purposes, then that is (presumably?) illegal. That aside, though, I doubt aldi have any legal basis for compelling customers not to resell items simply because that's not what it intends.
I'll reiterate my scepticism towards aldi products based on the fact that the zips keep breaking - I had an aldi cycling jacket that I was given, which was great (albeit not waterproof) apart from the fact that the zip kept coming undone from the bottom upwards, and then the zipper wouldn't move down. So I took it back, they were to their credit unobstructive in giving me a refund despite not having the receipt and the fact it wasn't me that bought it (but it was only £6.99).
On another occasion, I tried on a coat in the store and when I was trying to get it off, the zip bust, and I couldn't get it off. (After struggling with it for a bit I eventually got it off over my head.)
I have actually got a 3 in 1 jacket from there which I like however and touch wood the zip is still ok.