I bought a used 2018 RG550 Genesis about 6 months ago for just over £400 GB. It has a volute and a 5 piece neck to prevent cracks and twists. What's moee there's not 25+ years of wear and tear.
I gig and need well made, reliable instruments. Yes they have a reputation but why would I want to spend more and take a risk on an old RG550? It's white BTW.
I agree with you,i am a little sceptical buying a used old rg550. .
The problem with a new one though,is the resale value.Like you said you got it for 400gbp and it cost about 800gbp new.