If you want to reblue so it will look great when you get it out to shoot, ie, to please your own sensibilities, then go ahead.
If you want to reblue for investment purposes, that calculation will depend on what you paid for it and what a reblue job equal in quality to the gun costs, and what a reblued model can sell for. If you got it cheap, and from your post it sounds like you might have, then at worst you might end up with a wash, money wise, but then you get to enjoy how good it looks compared to before, and that is also a value.
If you are worried about messing it up somehow, don't. If you ruin it (assuming that is possible) beyond repair, then there is one less of a limited number and everyone else who has one gets a small boost to the value of their gun. Thanks! If you succeed, then you have repaired a rare thing that deserved your efforts, and you get applauded by your companions and the satisfaction of a good deed done.
