It's not just prices that drive people's decisions to shop in places like Lidl and Aldi, although I admit it's a major factor. Like I said earlier, I love that you don't have to listen to music in Aldi - supermarket music has been a major pet peeve of mine for as long as I can remember. It's either blaring so loud you can't hear yourself think, stuff you'd never dream of listening to anyway or - worst of all - a track you associate with a sad time in your life or a lost loved one so that you've got a job not to burst into tears as you rush round at speed and exit with only half your shopping.
What's really pee-ing me off about Asda at the moment is the crafty way they hike prices at times by mysteriously eliminating cheaper items. I've been doing the weekly shop in Aldi for a while, but have been visiting Asda afterwards for the one thing I can't get there - the massive bunches of parsley that I feed my guinea pigs. These bunches cost 97p and last our piggies about three days. A month or so ago, they were constantly out of stock and so I had to ration the piggies a bit and buy the tiny packets that cost 85p and last the piggies about ten minutes. After a week of this (by which time ALL the bunched herbs were out of stock) I asked a staff member when they'd be back in again and she told me that they'd only be stocking the small packets until after Christmas.
If difficulty in sourcing a product temporarily takes my weekly parsley spend from £3 to approx £14(!) I'm not going to like it, but I'll understand it. If it's simply caused by greedy Asda's attempt to fleece people just because it's the 'season of goodwill', then I'm out of there and buying my tiny packets of parsley (and all the impulse purchases that went with them) in Aldi instead. I did e-mail them and tell them as much, but didn't get a reply and didn't expect one.
I still buy the odd essential in Asda now just because it's so close to us (the entire neighbourhood basks in their 24/7 light pollution!), but refuse to buy anything I didn't actually go in there for unless it's heavily discounted. It did make me smile on boxing day to see a big pile of tiny parsley (and other herb) packets with 'reduced' yellow stickers on them. Asda obviously over-estimated the demand from people willing to be manipulated into garnishing and flavouring their festive grub at inflated prices.

No wonder their market share is falling.