I tend to agree with Wbill.. providing at least that the poorer-quality kit
is cheaper and older than the better one! There's no excuse for new mouldings (as opposed
to reissues) being poor-quality nowadays.
My idea of a "bad" kit is generally 40/50-year old Airfix/Frog/Matchbox (and I still build plenty of those!),
rather than 20/30-year old Tamiya, etc! But that's just me - I buy 90% of my kits second-hand and rarely pay
more than £10, most kits I buy are between £3 and £6. Newer kits rarely turn up in second-hand model sales and if they
do they aren't usually much cheaper than retail prices. And "half price sales" are rarer than a 1/32 B-36 in UK model shops!
Maybe if I had a bigger budget, I'd be more willing to pay £20-£30 for the latest kits. But I enjoy the challenge of building models from older kits - finding references for new colour schemes, adding scratchbuilt details etc. That's just
what I enjoy about modelling - I understand why newer modellers don't want the hassle of dealing with flash, poor fit, etc.