fyl2u
Striker
They were niche,they didn't want to be big,some bordering on Crusties etc .Blur and Oasis started small and got noticed ,same playing field .They did all the work before the press luvvies started hanging onto them .Oasis and blur seemed to appeal to the normal dressed kids who didn't want to be different (hence a bigger crowd) .The lot you speak of did plenty albums ,not 1 so they were out there and did what they did .Cant see how a few extra quid will make their songs better and they certainly weren't going to conform and cut their dreads etc
The few quid extra spent on them is the only thing that separated Oasis from half the no name pub bands we had around that time.
Production is like a magic trick. Spend a shedload on it and you can make any band sound like geniuses to folks that don't know how the "magic" tricks work.