The question is for everyone

Because sometimes I have mixed feelings: should I keep one set in its original factory condition and buy another one to customise, or?
Ever since I started collecting the old knight sets from the 90s, I try to keep them as they originally came out, but the later sets - the ones I bought from the shops - I never bothered doing that. For eg all my blue Romans (specials) i swapped their gold helmet for a silver one) and so on. It's very expensive to buy two of each set ... if not more

My ... this is one expensive hobby isn't it?