When I replied to that post I was responding the avios recommendation. Nectar hadn’t come into the thought process for me yet!
No source, just anecdotal from my own social groups and the work discourse when the supermarket surveys come out. No one shops at Sainsburys or Morrisons.
Kantar’s sample size is quite small and is based on item value. More expensive super markets will fare better here, and the likes of Lidl, Asda (who I would have expected to be at the top), and Aldi are hindered because of it. The data is up for interpretation, and Kantar make no claims of their own other than to present it as is. Which is to say for me, it doesn’t bear much weight. And 15% is a relatively small share regardless. (There are only 4 big supermarkets). Perhaps if you’re someone who shops there, you could make one of these cards work for you. But if you don’t, you can’t.
Amazon will deliver almost anything Argos sell next day. The product will almost always be cheaper on Amazon too. You can certainly click and collect if you’d prefer, but Argos are in the process of shutting that business down and relocating employees to Sainsburys. Some collection points will remain in the larger stores, but they ultimately want the customer to be buying online for home delivery. At least that’s the plan last I was updated on it.
But if the goal is saving money, you’ve got to factor in your travel costs to and from the collection point as well. It quickly adds up and diminishes the savings you’ll make.
It does, but not when you take advantage of statistics to vastly misrepresent the data by using percentages like that. 30-50% more rewards isn’t as much as it sounds when the value of said rewards are tiny to begin with.
The Barclaycard Avios for example, the free one one. If you spend £5000 you’ll save £40 on something. It’s roughly the equivalent to earning 0.75% on cashback.
Now if you spend £5000 on a 0.5% cashback credit card, you’ll get £25 back. So the real saving with Nectar is £15. Might sound like a lot, but you’ve had to spend £5K to get there, but that’s not where it ends either. You can only benefit from that little extra by restricting where you’re actually allowed to spend it. And you have to spend it, you can’t just funnel into savings like you could with regular cashback.
Let’s say I want to use my Nectar points on some AirPods, and I have to buy those from Argos: £179 + £3.95 for delivery. Most online retailers will ship them for free, so that’s £4 off your savings with Nectar already, diminishing it to £11.
So now it’s a case of, can I save £11 or more elsewhere? At which point I’m not better off going through all this hassle, and limiting myself to a company who are dreadful to deal with in aftercare support, and slower to deliver. Particularly if you click and collect and forego your protections under distance selling. Don’t forget to deduct your fuel expenses from that £11 saving too! 
The answer here isn’t only yes, you can save £11 or more, but you can often save a lot more than just £11. They’re £10 cheaper on Amazon, with next day delivery (or even same day with prime in some locations) as standard. And if you don’t have prime the free standard shipping is still faster than Argos. So you’ve saved £1 there for a lot of effort, hassle, and inconvenience. I’m not so sure that’s worth it. And even if it is to you, that’s definitely not something that’s for everyone.
The AirPods are cheaper elsewhere, can be bought under some 10% off promo codes at places like o2, saving you almost £20 on RRP, and Amazon regularly discount them by as much as 11% which saves you more than £20.
This isn’t even a specific example I’ve picked selectively. It was just the first one that popped to mind. It’s similar for the vast majority of things Argos sell. Their own home furniture range too. It’s just China made drop shipped stuff that other companies sell under their own brand for cheaper too. So it’s not just limited to branded tech goods.
If I shopped at those places regularly anyway, there’s probably a benefit to them. But I don’t, so there isn’t. My whole point here was just that avios isn’t for everyone. I feel like you’ve conflated that with anyone.
It might work for you, and that’s great. You might be happy to put the work in, or maybe you don’t need to because it fits your lifestyle as is anyway. But for most people that’s not going to be the case. And the best you have to counter that is that 15% of folks shop at Sainsburys. It might make them the second largest by your metric, but that’s still serving a minority of people.
Strongly disagree with this. Avios has saved my friend several thousands. But they travel a lot in first class, and stay in expensive hotels. So it’s saved them relative to what they would have paid, but they certainly could live the lifestyle cheaper if they wanted.