I agree with Mr.Z. Modded watches are a serious problem, and determining their value is often very difficult.
But I can give you one example:
My extremely rare, best-ever Rolex replica base, Explorer II frankenwatch with GENUINE DIAL and correct hand stack... guess what I paid?
Yes. $350 + shipping. I know it was a bargain, but that's something that could be described as "fair price". It's still a rep, although very nice.
If someone asks $900 for a Chinese Submariner (MBW/WMB/BMW) with RBJ scam mods, call him out. Or stay away. Make some research, don't be an idiot.
The veteran members and mods are here to protect you, but we're not going to change your diaper. This place is a hobby for us, not a job. We're not on anyone's payroll... we don't get a DIME for our efforts So it's unreasonable to except us to control all the sales threads. It's simply not possible. All members should feel equally responsible for others.
And YOU have the ultimate responsibility for your money, not us. This community has always been a "learning experience". When in doubt, ask questions and make more research. It's a cruel world out there, so be careful.