Its not that people are lazy or ignorant they may not have the money, time or know how to replace their timing belt. and when you put "no offence" as your two first words people will get offended.
to the OP, I have found that engines are not all that expensive for the pathfinder if that is what it needs, so $400 for one that looks like it has a great body is a real find! I am fixing mine up trying to keep it stock as much as possible, but the call of a solid front axle is really tempting. Good luck with the pathy hope that you get it!