Some supermarket fireworks can be very good. The majority are rubbish and hellishly overpriced, yes, but there are always some hidden gems in at least one supermarket. In the past I have only gone to supermarkets - my local suppliers would sell the same stock at triple the price, although recently I have travelled further to specialist shops which have some nice deals and better, more impressive items.
Well my reasons are because supermarkets are much cheaper on the specific items i choose and because they make good fillers to the display. I would be very surprised if a retailer could match the value of the Fire Fight pack from Aldi for 5 pound. On the other hand i always get a good amount of pyro from retailers before hitting the supermarkets.
i suspect most people buy from supermarkets because they are there in your face.
as for being cheap ,yeah you can get a cheap £5 box,cheaper than a pack of fags ,,for a bit of fun, but then things turn shady. last year the £10 solar frenzy box morrisons,was without a doubt THE worst box of fireworks ive ever had,and ive been buying fireworks for 25 years.
lidl has proved you can get good stuff at good prices from supermarkets,but it is the exception.a few years back you could get decent stuff ,i had a great box of standard fireworks about 5 years back from sainsburys ,not since.
supermarkets bring fireworks to the people.to get good fireworks ,the people have to travel and seek , and for a lot of them ,thats too much to ask.
I think its pretty obvious that you get much better pyro from retailers than you do from supermarkets but not everyone has a budget thats 300, 500 or more. I know i would personally not walk into a retailer and say my budget was 30 pound just not something i would do lol. I'd much rather go to lidl and get a few cyber boxes and cakes which in all honesty is probably more than you would get from a retailer with that budget.
Most people don't spend hours looking at firework videos and when they pick up the weekly shop they grab the nearest box that says "BUY ONE GET ONE FREE". They most likely get home and set the fireworks off and are disappointed, but they forget how disappointed they were by the same time next year and buy the same box again. Fact of life, sorry.