I'm too lazy to read all the stuff people said here, but I think it would be a good idea. ;)
People who make money with Rerolls have nothing to fear. Since the way to obtain Rerolls are the same, prices are not going to lower, at least not cos of that option.
For those who spoke about difficulties blah blah blah, I dont care about your opinion. I used many Rerolls on some of my legendaries and I already lost a decent Mew for a trash one.
There is a differences beetween a normal difficulty and stupidity.
Spamming a 600K worth Item several time to get a very good legendary even when you already have a decent one is meh.
This option would make rerolling less risky and more pleasant.
I will also do as someone already did here.
I will talk a bit about the option to reroll specific IVs. Did not read all once more, but did read some.
For me it would be a great idea to be able to lock some IVs. There could be a poll to know if people want this option (If this is possible, of course).
I dont know how much IVs we should be able to lock.
This could be a specific Reroll too, wich could worth same, more or even less than usuall Reroll. Like a Speed IVs reroll.
The thing to think about this option is how to make this not harmfull for the usuall Reroll and also for the economy.
There is many way to do that, I dont know them all.
I still wrote a paragraph. =3
Good day, Good game! =P