But you don't want to be too drab. We almost passed on our current house because the newly applied paint was boring grey. We did buy it, but only after deciding it would be painted before we moved in. If they had put in some color - any color we would have lived with it.
I want to replace the grey vinyl floors, but it is hard to justify that cost.
Paint is cheap, relative to the probability and cost of finding a similar house you like, where you like, in the timeframe you want it. Flooring is relatively cheap too.
I would never pass on a house for those reasons, at least not where I live since supply of alternative houses is so low.
Then there is a net loss of an extra redecoration: one to prepare it for sale and another to prepare it to be lived in, rather than just one by the new owner.